Patch "net/ipv6: Correct PIM6 mrt_lock handling" has been added to the 3.10-stable tree

Patch "net/ipv6: Correct PIM6 mrt_lock handling" has been added to the 3.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    net/ipv6: Correct PIM6 mrt_lock handling

to the 3.10-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:
     net-ipv6-correct-pim6-mrt_lock-handling.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Tue Sep 29 14:20:47 CEST 2015
From: Richard Laing <richard.laing@alliedtelesis.co.nz>
Date: Thu, 3 Sep 2015 13:52:31 +1200
Subject: net/ipv6: Correct PIM6 mrt_lock handling

From: Richard Laing <richard.laing@alliedtelesis.co.nz>

[ Upstream commit 25b4a44c19c83d98e8c0807a7ede07c1f28eab8b ]

In the IPv6 multicast routing code the mrt_lock was not being released
correctly in the MFC iterator, as a result adding or deleting a MIF would
cause a hang because the mrt_lock could not be acquired.

This fix is a copy of the code for the IPv4 case and ensures that the lock
is released correctly.

Signed-off-by: Richard Laing <richard.laing@alliedtelesis.co.nz>
Acked-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/ip6mr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -552,7 +552,7 @@ static void ipmr_mfc_seq_stop(struct seq
 
 	if (it->cache == &mrt->mfc6_unres_queue)
 		spin_unlock_bh(&mfc_unres_lock);
-	else if (it->cache == mrt->mfc6_cache_array)
+	else if (it->cache == &mrt->mfc6_cache_array[it->ct])
 		read_unlock(&mrt_lock);
 }
 


Patches currently in stable-queue which might be from richard.laing@alliedtelesis.co.nz are

queue-3.10/net-ipv6-correct-pim6-mrt_lock-handling.patch