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tcp: handle tcp_net_metrics_init() order-5 memory allocation failures 

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>
This commit is contained in:
Eric Dumazet 2012-11-16 05:31:53 +00:00 committed by David S. Miller
parent 6fc4adca6c
commit 976a702ac9
1 changed files with 9 additions and 3 deletions
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12
net/ipv4/tcp_metrics.c
View File

@ -1,7 +1,6 @@
#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>
@ -9,6 +8,7 @@
#include <linux/tcp.h>
#include <linux/hash.h>
#include <linux/tcp_metrics.h>
#include <linux/vmalloc.h>
#include <net/inet_connection_sock.h>
#include <net/net_namespace.h>
@ -1034,7 +1034,10 @@ static int __net_init tcp_net_metrics_init(struct net *net)
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;
@ -1055,7 +1058,10 @@ static void __net_exit tcp_net_metrics_exit(struct net *net)
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 = {