linux-kernel - [PATCH 4.2 06/30] net/ipv6: Correct PIM6 mrt

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Message-Id: <20151001092038.477404690@linuxfoundation.org>
Date:	Thu,  1 Oct 2015 11:21:28 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Richard Laing <richard.laing@...iedtelesis.co.nz>,
	Cong Wang <cwang@...pensource.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.2 06/30] net/ipv6: Correct PIM6 mrt_lock handling

4.2-stable review patch.  If anyone has any objections, please let me know.

------------------

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

--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -550,7 +550,7 @@ 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);
 }
 


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