[ 60/83] tcp: handle tcp_net_metrics_init() order-5 memory allocation failures
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2012-11-22 21:42:47
Also in:
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3.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet <redacted> [ Upstream commit 976a702ac9eeacea09e588456ab165dc06f9ee83 ] order-5 allocations can fail with current kernels, we should try vmalloc() as well. Reported-by: Julien Tinnes <redacted> 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 = {