This is a note to let you know that I've just added the patch titled
ipv6: fix possible seqlock deadlock in ip6_finish_output2
to the 3.12-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-possible-seqlock-deadlock-in-ip6_finish_output2.patch
and it can be found in the queue-3.12 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 Dec 5 16:16:39 PST 2013
From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 29 Nov 2013 06:39:44 +0100
Subject: ipv6: fix possible seqlock deadlock in ip6_finish_output2
From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
[ Upstream commit 7f88c6b23afbd31545c676dea77ba9593a1a14bf ]
IPv6 stats are 64 bits and thus are protected with a seqlock. By not
disabling bottom-half we could deadlock here if we don't disable bh and
a softirq reentrantly updates the same mib.
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Signed-off-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/ip6_output.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -116,8 +116,8 @@ static int ip6_finish_output2(struct sk_
}
rcu_read_unlock_bh();
- IP6_INC_STATS_BH(dev_net(dst->dev),
- ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+ IP6_INC_STATS(dev_net(dst->dev),
+ ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
kfree_skb(skb);
return -EINVAL;
}
Patches currently in stable-queue which might be from hannes@xxxxxxxxxxxxxxxxxxx are
queue-3.12/ipv6-fix-inet6_init-cleanup-order.patch
queue-3.12/ipv6-fix-headroom-calculation-in-udp6_ufo_fragment.patch
queue-3.12/ping-prevent-null-pointer-dereference-on-write-to-msg_name.patch
queue-3.12/inet-prevent-leakage-of-uninitialized-memory-to-user-in-recv-syscalls.patch
queue-3.12/net-rework-recvmsg-handler-msg_name-and-msg_namelen-logic.patch
queue-3.12/ipv6-fix-possible-seqlock-deadlock-in-ip6_finish_output2.patch
queue-3.12/net-add-bug_on-if-kernel-advertises-msg_namelen-sizeof-struct-sockaddr_storage.patch
queue-3.12/ipv6-use-rt6_get_dflt_router-to-get-default-router-in.patch
queue-3.12/random32-fix-off-by-one-in-seeding-requirement.patch
queue-3.12/inet-fix-possible-seqlock-deadlocks.patch
queue-3.12/inet-fix-addr_len-msg-msg_namelen-assignment-in-recv_error-and-rxpmtu-functions.patch
queue-3.12/ipv6-protect-for_each_sk_fl_rcu-in-mem_check-with.patch
queue-3.12/ipv6-fix-leaking-uninitialized-port-number-of-offender-sockaddr.patch
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