netdev - [PATCH v3] ipv4 : igmp : fix error handle in ip_mc_add

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Message-Id: <1322018343-7552-1-git-send-email-mypopydev@gmail.com>
Date:	Wed, 23 Nov 2011 11:19:03 +0800
From:	Jun Zhao <mypopydev@...il.com>
To:	davem@...emloft.net
Cc:	eric.dumazet@...il.com, dlstevens@...ibm.com,
	netdev@...r.kernel.org, Jun Zhao <mypopydev@...il.com>
Subject: [PATCH v3] ipv4 : igmp : fix error handle in ip_mc_add_src()

from: Jun Zhao <mypopydev@...il.com>

When add sources to interface failure, need to roll back the sfcount[MODE]
to before state. We need to match it corresponding.

Acked-by: David L Stevens <dlstevens@...ibm.com>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Jun Zhao <mypopydev@...il.com>
---
 net/ipv4/igmp.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index c7472ef..b2ca095 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1716,7 +1716,8 @@ static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 	if (err) {
 		int j;
 
-		pmc->sfcount[sfmode]--;
+		if (!delta)
+			pmc->sfcount[sfmode]--;
 		for (j=0; j<i; j++)
 			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
 	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
-- 
1.7.2.5

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