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Subject[ 60/83] tcp: handle tcp_net_metrics_init() order-5 memory allocation failures
Date
3.6-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Eric Dumazet <eric.dumazet@gmail.com>

[ Upstream commit 976a702ac9eeacea09e588456ab165dc06f9ee83 ]

order-5 allocations can fail with current kernels, we should
try vmalloc() as well.

Reported-by: Julien Tinnes <jln@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ipv4/tcp_metrics.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -1,13 +1,13 @@
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
#include <linux/jiffies.h>
-#include <linux/bootmem.h>
#include <linux/module.h>
#include <linux/cache.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/tcp.h>
#include <linux/hash.h>
+#include <linux/vmalloc.h>

#include <net/inet_connection_sock.h>
#include <net/net_namespace.h>
@@ -722,7 +722,10 @@ static int __net_init tcp_net_metrics_in
net->ipv4.tcp_metrics_hash_log = order_base_2(slots);
size = sizeof(struct tcpm_hash_bucket) << net->ipv4.tcp_metrics_hash_log;

- net->ipv4.tcp_metrics_hash = kzalloc(size, GFP_KERNEL);
+ net->ipv4.tcp_metrics_hash = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
+ if (!net->ipv4.tcp_metrics_hash)
+ net->ipv4.tcp_metrics_hash = vzalloc(size);
+
if (!net->ipv4.tcp_metrics_hash)
return -ENOMEM;

@@ -743,7 +746,10 @@ static void __net_exit tcp_net_metrics_e
tm = next;
}
}
- kfree(net->ipv4.tcp_metrics_hash);
+ if (is_vmalloc_addr(net->ipv4.tcp_metrics_hash))
+ vfree(net->ipv4.tcp_metrics_hash);
+ else
+ kfree(net->ipv4.tcp_metrics_hash);
}

static __net_initdata struct pernet_operations tcp_net_metrics_ops = {



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