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Subject[PATCH -next, v2] audit: use struct_size() helper in kmalloc()
Date
Make use of struct_size() helper instead of an open-coded calculation.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
---
include/uapi/linux/audit.h | 2 +-
kernel/audit.c | 4 ++--
kernel/audit_tree.c | 2 +-
kernel/auditfilter.c | 4 ++--
4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
index 9176a095fefc..8eda133ca4c1 100644
--- a/include/uapi/linux/audit.h
+++ b/include/uapi/linux/audit.h
@@ -514,7 +514,7 @@ struct audit_rule_data {
__u32 values[AUDIT_MAX_FIELDS];
__u32 fieldflags[AUDIT_MAX_FIELDS];
__u32 buflen; /* total length of string fields */
- char buf[0]; /* string fields buffer */
+ char buf[]; /* string fields buffer */
};

#endif /* _UAPI_LINUX_AUDIT_H_ */
diff --git a/kernel/audit.c b/kernel/audit.c
index d4084751cfe6..7778eca34837 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -1446,7 +1446,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (err)
return err;
}
- sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
+ sig_data = kmalloc(struct_size(sig_data, ctx, len), GFP_KERNEL);
if (!sig_data) {
if (audit_sig_sid)
security_release_secctx(ctx, len);
@@ -1459,7 +1459,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
security_release_secctx(ctx, len);
}
audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0,
- sig_data, sizeof(*sig_data) + len);
+ sig_data, struct_size(sig_data, ctx, len));
kfree(sig_data);
break;
case AUDIT_TTY_GET: {
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 72324afcffef..e7315d487163 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -94,7 +94,7 @@ static struct audit_tree *alloc_tree(const char *s)
{
struct audit_tree *tree;

- tree = kmalloc(sizeof(struct audit_tree) + strlen(s) + 1, GFP_KERNEL);
+ tree = kmalloc(struct_size(tree, pathname, strlen(s) + 1), GFP_KERNEL);
if (tree) {
refcount_set(&tree->count, 1);
tree->goner = 0;
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 4173e771650c..42d99896e7a6 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -637,7 +637,7 @@ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule)
void *bufp;
int i;

- data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL);
+ data = kmalloc(struct_size(data, buf, krule->buflen), GFP_KERNEL);
if (unlikely(!data))
return NULL;
memset(data, 0, sizeof(*data));
@@ -1092,7 +1092,7 @@ static void audit_list_rules(int seq, struct sk_buff_head *q)
break;
skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1,
data,
- sizeof(*data) + data->buflen);
+ struct_size(data, buf, data->buflen));
if (skb)
skb_queue_tail(q, skb);
kfree(data);
--
2.17.1
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