This is a note to let you know that I've just added the patch titled
ipv6: Fix mem leak in rt6i_pcpu
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ipv6-fix-mem-leak-in-rt6i_pcpu.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Jul 14 07:36:31 JST 2016
From: Martin KaFai Lau <kafai@xxxxxx>
Date: Tue, 5 Jul 2016 12:10:23 -0700
Subject: ipv6: Fix mem leak in rt6i_pcpu
From: Martin KaFai Lau <kafai@xxxxxx>
[ Upstream commit 903ce4abdf374e3365d93bcb3df56c62008835ba ]
It was first reported and reproduced by Petr (thanks!) in
https://bugzilla.kernel.org/show_bug.cgi?id=119581
free_percpu(rt->rt6i_pcpu) used to always happen in ip6_dst_destroy().
However, after fixing a deadlock bug in
commit 9c7370a166b4 ("ipv6: Fix a potential deadlock when creating pcpu rt"),
free_percpu() is not called before setting non_pcpu_rt->rt6i_pcpu to NULL.
It is worth to note that rt6i_pcpu is protected by table->tb6_lock.
kmemleak somehow did not report it. We nailed it down by
observing the pcpu entries in /proc/vmallocinfo (first suggested
by Hannes, thanks!).
Signed-off-by: Martin KaFai Lau <kafai@xxxxxx>
Fixes: 9c7370a166b4 ("ipv6: Fix a potential deadlock when creating pcpu rt")
Reported-by: Petr Novopashenniy <pety@xxxxxxxxx>
Tested-by: Petr Novopashenniy <pety@xxxxxxxxx>
Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Cc: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Cc: Petr Novopashenniy <pety@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/ip6_fib.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -179,6 +179,7 @@ static void rt6_free_pcpu(struct rt6_inf
}
}
+ free_percpu(non_pcpu_rt->rt6i_pcpu);
non_pcpu_rt->rt6i_pcpu = NULL;
}
Patches currently in stable-queue which might be from kafai@xxxxxx are
queue-4.4/ipv6-fix-mem-leak-in-rt6i_pcpu.patch
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