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SubjectRe: Linux 5.10.55
Date
diff --git a/Makefile b/Makefile
index eb01d3028b02..7fb6405f3b60 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
VERSION = 5
PATCHLEVEL = 10
-SUBLEVEL = 54
+SUBLEVEL = 55
EXTRAVERSION =
NAME = Dare mighty things

diff --git a/arch/arm/boot/dts/versatile-ab.dts b/arch/arm/boot/dts/versatile-ab.dts
index 37bd41ff8dff..151c0220047d 100644
--- a/arch/arm/boot/dts/versatile-ab.dts
+++ b/arch/arm/boot/dts/versatile-ab.dts
@@ -195,16 +195,15 @@ amba {
#size-cells = <1>;
ranges;

- vic: intc@10140000 {
+ vic: interrupt-controller@10140000 {
compatible = "arm,versatile-vic";
interrupt-controller;
#interrupt-cells = <1>;
reg = <0x10140000 0x1000>;
- clear-mask = <0xffffffff>;
valid-mask = <0xffffffff>;
};

- sic: intc@10003000 {
+ sic: interrupt-controller@10003000 {
compatible = "arm,versatile-sic";
interrupt-controller;
#interrupt-cells = <1>;
diff --git a/arch/arm/boot/dts/versatile-pb.dts b/arch/arm/boot/dts/versatile-pb.dts
index 06a0fdf24026..e7e751a858d8 100644
--- a/arch/arm/boot/dts/versatile-pb.dts
+++ b/arch/arm/boot/dts/versatile-pb.dts
@@ -7,7 +7,7 @@ / {

amba {
/* The Versatile PB is using more SIC IRQ lines than the AB */
- sic: intc@10003000 {
+ sic: interrupt-controller@10003000 {
clear-mask = <0xffffffff>;
/*
* Valid interrupt lines mask according to
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 800914e9e12b..3ad6f77ea1c4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -541,8 +541,6 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,

if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) {
queue:
- if (has_error && !is_protmode(vcpu))
- has_error = false;
if (reinject) {
/*
* On vmentry, vcpu->arch.exception.pending is only
@@ -8265,6 +8263,13 @@ static void update_cr8_intercept(struct kvm_vcpu *vcpu)
kvm_x86_ops.update_cr8_intercept(vcpu, tpr, max_irr);
}

+static void kvm_inject_exception(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->arch.exception.error_code && !is_protmode(vcpu))
+ vcpu->arch.exception.error_code = false;
+ kvm_x86_ops.queue_exception(vcpu);
+}
+
static void inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit)
{
int r;
@@ -8273,7 +8278,7 @@ static void inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit
/* try to reinject previous events if any */

if (vcpu->arch.exception.injected) {
- kvm_x86_ops.queue_exception(vcpu);
+ kvm_inject_exception(vcpu);
can_inject = false;
}
/*
@@ -8336,7 +8341,7 @@ static void inject_pending_event(struct kvm_vcpu *vcpu, bool *req_immediate_exit
}
}

- kvm_x86_ops.queue_exception(vcpu);
+ kvm_inject_exception(vcpu);
can_inject = false;
}

diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
index af4560dab6b4..8c9663258d5d 100644
--- a/drivers/firmware/arm_scmi/driver.c
+++ b/drivers/firmware/arm_scmi/driver.c
@@ -43,7 +43,6 @@ enum scmi_error_codes {
SCMI_ERR_GENERIC = -8, /* Generic Error */
SCMI_ERR_HARDWARE = -9, /* Hardware Error */
SCMI_ERR_PROTOCOL = -10,/* Protocol Error */
- SCMI_ERR_MAX
};

/* List of all SCMI devices active in system */
@@ -118,8 +117,10 @@ static const int scmi_linux_errmap[] = {

static inline int scmi_to_linux_errno(int errno)
{
- if (errno < SCMI_SUCCESS && errno > SCMI_ERR_MAX)
- return scmi_linux_errmap[-errno];
+ int err_idx = -errno;
+
+ if (err_idx >= SCMI_SUCCESS && err_idx < ARRAY_SIZE(scmi_linux_errmap))
+ return scmi_linux_errmap[err_idx];
return -EIO;
}

@@ -614,8 +615,9 @@ static int __scmi_xfer_info_init(struct scmi_info *sinfo,
const struct scmi_desc *desc = sinfo->desc;

/* Pre-allocated messages, no more than what hdr.seq can support */
- if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) {
- dev_err(dev, "Maximum message of %d exceeds supported %ld\n",
+ if (WARN_ON(!desc->max_msg || desc->max_msg > MSG_TOKEN_MAX)) {
+ dev_err(dev,
+ "Invalid maximum messages %d, not in range [1 - %lu]\n",
desc->max_msg, MSG_TOKEN_MAX);
return -EINVAL;
}
diff --git a/drivers/gpu/drm/ttm/ttm_range_manager.c b/drivers/gpu/drm/ttm/ttm_range_manager.c
index 1da0e277c511..ce9d127edbb5 100644
--- a/drivers/gpu/drm/ttm/ttm_range_manager.c
+++ b/drivers/gpu/drm/ttm/ttm_range_manager.c
@@ -147,6 +147,9 @@ int ttm_range_man_fini(struct ttm_bo_device *bdev,
struct drm_mm *mm = &rman->mm;
int ret;

+ if (!man)
+ return 0;
+
ttm_resource_manager_set_used(man, false);

ret = ttm_resource_manager_force_list_clean(bdev, man);
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index b0b06eb86edf..81e087723777 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -497,8 +497,8 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
p = buf;
while (bytes_left >= sizeof(*p)) {
info->speed = le64_to_cpu(p->LinkSpeed);
- info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
- info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
+ info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
+ info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;

cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
diff --git a/fs/hfs/bfind.c b/fs/hfs/bfind.c
index 4af318fbda77..ef9498a6e88a 100644
--- a/fs/hfs/bfind.c
+++ b/fs/hfs/bfind.c
@@ -25,7 +25,19 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
fd->key = ptr + tree->max_key_len + 2;
hfs_dbg(BNODE_REFS, "find_init: %d (%p)\n",
tree->cnid, __builtin_return_address(0));
- mutex_lock(&tree->tree_lock);
+ switch (tree->cnid) {
+ case HFS_CAT_CNID:
+ mutex_lock_nested(&tree->tree_lock, CATALOG_BTREE_MUTEX);
+ break;
+ case HFS_EXT_CNID:
+ mutex_lock_nested(&tree->tree_lock, EXTENTS_BTREE_MUTEX);
+ break;
+ case HFS_ATTR_CNID:
+ mutex_lock_nested(&tree->tree_lock, ATTR_BTREE_MUTEX);
+ break;
+ default:
+ return -EINVAL;
+ }
return 0;
}

diff --git a/fs/hfs/bnode.c b/fs/hfs/bnode.c
index b63a4df7327b..c0a73a6ffb28 100644
--- a/fs/hfs/bnode.c
+++ b/fs/hfs/bnode.c
@@ -15,16 +15,31 @@

#include "btree.h"

-void hfs_bnode_read(struct hfs_bnode *node, void *buf,
- int off, int len)
+void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
{
struct page *page;
+ int pagenum;
+ int bytes_read;
+ int bytes_to_read;
+ void *vaddr;

off += node->page_offset;
- page = node->page[0];
+ pagenum = off >> PAGE_SHIFT;
+ off &= ~PAGE_MASK; /* compute page offset for the first page */

- memcpy(buf, kmap(page) + off, len);
- kunmap(page);
+ for (bytes_read = 0; bytes_read < len; bytes_read += bytes_to_read) {
+ if (pagenum >= node->tree->pages_per_bnode)
+ break;
+ page = node->page[pagenum];
+ bytes_to_read = min_t(int, len - bytes_read, PAGE_SIZE - off);
+
+ vaddr = kmap_atomic(page);
+ memcpy(buf + bytes_read, vaddr + off, bytes_to_read);
+ kunmap_atomic(vaddr);
+
+ pagenum++;
+ off = 0; /* page offset only applies to the first page */
+ }
}

u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off)
diff --git a/fs/hfs/btree.h b/fs/hfs/btree.h
index 4ba45caf5939..0e6baee93245 100644
--- a/fs/hfs/btree.h
+++ b/fs/hfs/btree.h
@@ -13,6 +13,13 @@ typedef int (*btree_keycmp)(const btree_key *, const btree_key *);

#define NODE_HASH_SIZE 256

+/* B-tree mutex nested subclasses */
+enum hfs_btree_mutex_classes {
+ CATALOG_BTREE_MUTEX,
+ EXTENTS_BTREE_MUTEX,
+ ATTR_BTREE_MUTEX,
+};
+
/* A HFS BTree held in memory */
struct hfs_btree {
struct super_block *sb;
diff --git a/fs/hfs/super.c b/fs/hfs/super.c
index 44d07c9e3a7f..12d9bae39363 100644
--- a/fs/hfs/super.c
+++ b/fs/hfs/super.c
@@ -420,14 +420,12 @@ static int hfs_fill_super(struct super_block *sb, void *data, int silent)
if (!res) {
if (fd.entrylength > sizeof(rec) || fd.entrylength < 0) {
res = -EIO;
- goto bail;
+ goto bail_hfs_find;
}
hfs_bnode_read(fd.bnode, &rec, fd.entryoffset, fd.entrylength);
}
- if (res) {
- hfs_find_exit(&fd);
- goto bail_no_root;
- }
+ if (res)
+ goto bail_hfs_find;
res = -EINVAL;
root_inode = hfs_iget(sb, &fd.search_key->cat, &rec);
hfs_find_exit(&fd);
@@ -443,6 +441,8 @@ static int hfs_fill_super(struct super_block *sb, void *data, int silent)
/* everything's okay */
return 0;

+bail_hfs_find:
+ hfs_find_exit(&fd);
bail_no_root:
pr_err("get root inode failed\n");
bail:
diff --git a/fs/internal.h b/fs/internal.h
index a7cd0f64faa4..5155f6ce95c7 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -64,7 +64,6 @@ extern void __init chrdev_init(void);
*/
extern const struct fs_context_operations legacy_fs_context_ops;
extern int parse_monolithic_mount_data(struct fs_context *, void *);
-extern void fc_drop_locked(struct fs_context *);
extern void vfs_clean_context(struct fs_context *fc);
extern int finish_clean_context(struct fs_context *fc);

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 07f08c424d17..525b44140d7a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6266,7 +6266,6 @@ static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
if (prev) {
io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME);
io_put_req_deferred(prev, 1);
- io_put_req_deferred(req, 1);
} else {
io_cqring_add_event(req, -ETIME, 0);
io_put_req_deferred(req, 1);
diff --git a/fs/iomap/seek.c b/fs/iomap/seek.c
index 107ee80c3568..220c306167f7 100644
--- a/fs/iomap/seek.c
+++ b/fs/iomap/seek.c
@@ -140,23 +140,20 @@ loff_t
iomap_seek_hole(struct inode *inode, loff_t offset, const struct iomap_ops *ops)
{
loff_t size = i_size_read(inode);
- loff_t length = size - offset;
loff_t ret;

/* Nothing to be found before or beyond the end of the file. */
if (offset < 0 || offset >= size)
return -ENXIO;

- while (length > 0) {
- ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops,
- &offset, iomap_seek_hole_actor);
+ while (offset < size) {
+ ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT,
+ ops, &offset, iomap_seek_hole_actor);
if (ret < 0)
return ret;
if (ret == 0)
break;
-
offset += ret;
- length -= ret;
}

return offset;
@@ -186,27 +183,23 @@ loff_t
iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops)
{
loff_t size = i_size_read(inode);
- loff_t length = size - offset;
loff_t ret;

/* Nothing to be found before or beyond the end of the file. */
if (offset < 0 || offset >= size)
return -ENXIO;

- while (length > 0) {
- ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops,
- &offset, iomap_seek_data_actor);
+ while (offset < size) {
+ ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT,
+ ops, &offset, iomap_seek_data_actor);
if (ret < 0)
return ret;
if (ret == 0)
- break;
-
+ return offset;
offset += ret;
- length -= ret;
}

- if (length <= 0)
- return -ENXIO;
- return offset;
+ /* We've reached the end of the file without finding data */
+ return -ENXIO;
}
EXPORT_SYMBOL_GPL(iomap_seek_data);
diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
index 37e1e8f7f08d..5b44b0195a28 100644
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -139,6 +139,7 @@ extern int vfs_parse_fs_string(struct fs_context *fc, const char *key,
extern int generic_parse_monolithic(struct fs_context *fc, void *data);
extern int vfs_get_tree(struct fs_context *fc);
extern void put_fs_context(struct fs_context *fc);
+extern void fc_drop_locked(struct fs_context *fc);

/*
* sget() wrappers to be called from the ->get_tree() op.
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
index b001fa91c14e..716b7c5f6fdd 100644
--- a/include/net/busy_poll.h
+++ b/include/net/busy_poll.h
@@ -36,7 +36,7 @@ static inline bool net_busy_loop_on(void)

static inline bool sk_can_busy_loop(const struct sock *sk)
{
- return sk->sk_ll_usec && !signal_pending(current);
+ return READ_ONCE(sk->sk_ll_usec) && !signal_pending(current);
}

bool sk_busy_loop_end(void *p, unsigned long start_time);
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index 122d9e2d8dfd..1ad049ac2add 100644
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -340,8 +340,7 @@ enum {
#define SCTP_SCOPE_POLICY_MAX SCTP_SCOPE_POLICY_LINK

/* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
- * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
- * 192.88.99.0/24.
+ * SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 192.88.99.0/24.
* Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
* addresses.
*/
@@ -349,7 +348,6 @@ enum {
((htonl(INADDR_BROADCAST) == a) || \
ipv4_is_multicast(a) || \
ipv4_is_zeronet(a) || \
- ipv4_is_test_198(a) || \
ipv4_is_anycast_6to4(a))

/* Flags used for the bind address copy functions. */
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 04eb28f7735f..7f71b54c06c5 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -1225,9 +1225,7 @@ int cgroup1_get_tree(struct fs_context *fc)
ret = cgroup_do_get_tree(fc);

if (!ret && percpu_ref_is_dying(&ctx->root->cgrp.self.refcnt)) {
- struct super_block *sb = fc->root->d_sb;
- dput(fc->root);
- deactivate_locked_super(sb);
+ fc_drop_locked(fc);
ret = 1;
}

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 73bbe792fe1e..b338f514ee5a 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/rcu/tasks.h
@@ -879,10 +879,9 @@ static bool trc_inspect_reader(struct task_struct *t, void *arg)
in_qs = likely(!t->trc_reader_nesting);
}

- // Mark as checked. Because this is called from the grace-period
- // kthread, also remove the task from the holdout list.
+ // Mark as checked so that the grace-period kthread will
+ // remove it from the holdout list.
t->trc_reader_checked = true;
- trc_del_holdout(t);

if (in_qs)
return true; // Already in quiescent state, done!!!
@@ -909,7 +908,6 @@ static void trc_wait_for_one_reader(struct task_struct *t,
// The current task had better be in a quiescent state.
if (t == current) {
t->trc_reader_checked = true;
- trc_del_holdout(t);
WARN_ON_ONCE(t->trc_reader_nesting);
return;
}
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index b23f7d1044be..51d19fc71e61 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3670,15 +3670,21 @@ static void pwq_unbound_release_workfn(struct work_struct *work)
unbound_release_work);
struct workqueue_struct *wq = pwq->wq;
struct worker_pool *pool = pwq->pool;
- bool is_last;
+ bool is_last = false;

- if (WARN_ON_ONCE(!(wq->flags & WQ_UNBOUND)))
- return;
+ /*
+ * when @pwq is not linked, it doesn't hold any reference to the
+ * @wq, and @wq is invalid to access.
+ */
+ if (!list_empty(&pwq->pwqs_node)) {
+ if (WARN_ON_ONCE(!(wq->flags & WQ_UNBOUND)))
+ return;

- mutex_lock(&wq->mutex);
- list_del_rcu(&pwq->pwqs_node);
- is_last = list_empty(&wq->pwqs);
- mutex_unlock(&wq->mutex);
+ mutex_lock(&wq->mutex);
+ list_del_rcu(&pwq->pwqs_node);
+ is_last = list_empty(&wq->pwqs);
+ mutex_unlock(&wq->mutex);
+ }

mutex_lock(&wq_pool_mutex);
put_unbound_pool(pool);
diff --git a/net/802/garp.c b/net/802/garp.c
index 400bd857e5f5..f6012f8e59f0 100644
--- a/net/802/garp.c
+++ b/net/802/garp.c
@@ -203,6 +203,19 @@ static void garp_attr_destroy(struct garp_applicant *app, struct garp_attr *attr
kfree(attr);
}

+static void garp_attr_destroy_all(struct garp_applicant *app)
+{
+ struct rb_node *node, *next;
+ struct garp_attr *attr;
+
+ for (node = rb_first(&app->gid);
+ next = node ? rb_next(node) : NULL, node != NULL;
+ node = next) {
+ attr = rb_entry(node, struct garp_attr, node);
+ garp_attr_destroy(app, attr);
+ }
+}
+
static int garp_pdu_init(struct garp_applicant *app)
{
struct sk_buff *skb;
@@ -609,6 +622,7 @@ void garp_uninit_applicant(struct net_device *dev, struct garp_application *appl

spin_lock_bh(&app->lock);
garp_gid_event(app, GARP_EVENT_TRANSMIT_PDU);
+ garp_attr_destroy_all(app);
garp_pdu_queue(app);
spin_unlock_bh(&app->lock);

diff --git a/net/802/mrp.c b/net/802/mrp.c
index bea6e43d45a0..35e04cc5390c 100644
--- a/net/802/mrp.c
+++ b/net/802/mrp.c
@@ -292,6 +292,19 @@ static void mrp_attr_destroy(struct mrp_applicant *app, struct mrp_attr *attr)
kfree(attr);
}

+static void mrp_attr_destroy_all(struct mrp_applicant *app)
+{
+ struct rb_node *node, *next;
+ struct mrp_attr *attr;
+
+ for (node = rb_first(&app->mad);
+ next = node ? rb_next(node) : NULL, node != NULL;
+ node = next) {
+ attr = rb_entry(node, struct mrp_attr, node);
+ mrp_attr_destroy(app, attr);
+ }
+}
+
static int mrp_pdu_init(struct mrp_applicant *app)
{
struct sk_buff *skb;
@@ -895,6 +908,7 @@ void mrp_uninit_applicant(struct net_device *dev, struct mrp_application *appl)

spin_lock_bh(&app->lock);
mrp_mad_event(app, MRP_EVENT_TX);
+ mrp_attr_destroy_all(app);
mrp_pdu_queue(app);
spin_unlock_bh(&app->lock);

diff --git a/net/core/sock.c b/net/core/sock.c
index 7de51ea15cdf..d638c5361ed2 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1164,7 +1164,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
if (val < 0)
ret = -EINVAL;
else
- sk->sk_ll_usec = val;
+ WRITE_ONCE(sk->sk_ll_usec, val);
}
break;
#endif
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 341d0c7acc8b..72a673a43a75 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -60,10 +60,38 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
{
struct dst_entry *dst = skb_dst(skb);
struct net_device *dev = dst->dev;
+ unsigned int hh_len = LL_RESERVED_SPACE(dev);
+ int delta = hh_len - skb_headroom(skb);
const struct in6_addr *nexthop;
struct neighbour *neigh;
int ret;

+ /* Be paranoid, rather than too clever. */
+ if (unlikely(delta > 0) && dev->header_ops) {
+ /* pskb_expand_head() might crash, if skb is shared */
+ if (skb_shared(skb)) {
+ struct sk_buff *nskb = skb_clone(skb, GFP_ATOMIC);
+
+ if (likely(nskb)) {
+ if (skb->sk)
+ skb_set_owner_w(nskb, skb->sk);
+ consume_skb(skb);
+ } else {
+ kfree_skb(skb);
+ }
+ skb = nskb;
+ }
+ if (skb &&
+ pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
+ kfree_skb(skb);
+ skb = NULL;
+ }
+ if (!skb) {
+ IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
+ return -ENOMEM;
+ }
+ }
+
if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 47fb87ce489f..940f1e257a90 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -397,7 +397,8 @@ static enum sctp_scope sctp_v4_scope(union sctp_addr *addr)
retval = SCTP_SCOPE_LINK;
} else if (ipv4_is_private_10(addr->v4.sin_addr.s_addr) ||
ipv4_is_private_172(addr->v4.sin_addr.s_addr) ||
- ipv4_is_private_192(addr->v4.sin_addr.s_addr)) {
+ ipv4_is_private_192(addr->v4.sin_addr.s_addr) ||
+ ipv4_is_test_198(addr->v4.sin_addr.s_addr)) {
retval = SCTP_SCOPE_PRIVATE;
} else {
retval = SCTP_SCOPE_GLOBAL;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 39be4b52329b..37ffa7725cee 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -1521,6 +1521,53 @@ static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int peer)
return err;
}

+static void unix_peek_fds(struct scm_cookie *scm, struct sk_buff *skb)
+{
+ scm->fp = scm_fp_dup(UNIXCB(skb).fp);
+
+ /*
+ * Garbage collection of unix sockets starts by selecting a set of
+ * candidate sockets which have reference only from being in flight
+ * (total_refs == inflight_refs). This condition is checked once during
+ * the candidate collection phase, and candidates are marked as such, so
+ * that non-candidates can later be ignored. While inflight_refs is
+ * protected by unix_gc_lock, total_refs (file count) is not, hence this
+ * is an instantaneous decision.
+ *
+ * Once a candidate, however, the socket must not be reinstalled into a
+ * file descriptor while the garbage collection is in progress.
+ *
+ * If the above conditions are met, then the directed graph of
+ * candidates (*) does not change while unix_gc_lock is held.
+ *
+ * Any operations that changes the file count through file descriptors
+ * (dup, close, sendmsg) does not change the graph since candidates are
+ * not installed in fds.
+ *
+ * Dequeing a candidate via recvmsg would install it into an fd, but
+ * that takes unix_gc_lock to decrement the inflight count, so it's
+ * serialized with garbage collection.
+ *
+ * MSG_PEEK is special in that it does not change the inflight count,
+ * yet does install the socket into an fd. The following lock/unlock
+ * pair is to ensure serialization with garbage collection. It must be
+ * done between incrementing the file count and installing the file into
+ * an fd.
+ *
+ * If garbage collection starts after the barrier provided by the
+ * lock/unlock, then it will see the elevated refcount and not mark this
+ * as a candidate. If a garbage collection is already in progress
+ * before the file count was incremented, then the lock/unlock pair will
+ * ensure that garbage collection is finished before progressing to
+ * installing the fd.
+ *
+ * (*) A -> B where B is on the queue of A or B is on the queue of C
+ * which is on the queue of listening socket A.
+ */
+ spin_lock(&unix_gc_lock);
+ spin_unlock(&unix_gc_lock);
+}
+
static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds)
{
int err = 0;
@@ -2170,7 +2217,7 @@ static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg,
sk_peek_offset_fwd(sk, size);

if (UNIXCB(skb).fp)
- scm.fp = scm_fp_dup(UNIXCB(skb).fp);
+ unix_peek_fds(&scm, skb);
}
err = (flags & MSG_TRUNC) ? skb->len - skip : size;

@@ -2413,7 +2460,7 @@ static int unix_stream_read_generic(struct unix_stream_read_state *state,
/* It is questionable, see note in unix_dgram_recvmsg.
*/
if (UNIXCB(skb).fp)
- scm.fp = scm_fp_dup(UNIXCB(skb).fp);
+ unix_peek_fds(&scm, skb);

sk_peek_offset_fwd(sk, chunk);

diff --git a/tools/scripts/Makefile.include b/tools/scripts/Makefile.include
index 1358e89cdf7d..a3f99ef6b11b 100644
--- a/tools/scripts/Makefile.include
+++ b/tools/scripts/Makefile.include
@@ -39,8 +39,6 @@ EXTRA_WARNINGS += -Wundef
EXTRA_WARNINGS += -Wwrite-strings
EXTRA_WARNINGS += -Wformat

-CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)
-
# Makefiles suck: This macro sets a default value of $(2) for the
# variable named by $(1), unless the variable has been set by
# environment or command line. This is necessary for CC and AR
@@ -52,12 +50,22 @@ define allow-override
$(eval $(1) = $(2)))
endef

+ifneq ($(LLVM),)
+$(call allow-override,CC,clang)
+$(call allow-override,AR,llvm-ar)
+$(call allow-override,LD,ld.lld)
+$(call allow-override,CXX,clang++)
+$(call allow-override,STRIP,llvm-strip)
+else
# Allow setting various cross-compile vars or setting CROSS_COMPILE as a prefix.
$(call allow-override,CC,$(CROSS_COMPILE)gcc)
$(call allow-override,AR,$(CROSS_COMPILE)ar)
$(call allow-override,LD,$(CROSS_COMPILE)ld)
$(call allow-override,CXX,$(CROSS_COMPILE)g++)
$(call allow-override,STRIP,$(CROSS_COMPILE)strip)
+endif
+
+CC_NO_CLANG := $(shell $(CC) -dM -E -x c /dev/null | grep -Fq "__clang__"; echo $$?)

ifneq ($(LLVM),)
HOSTAR ?= llvm-ar
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