From b3347a23ce59ff79cf0ebc06ae9792da61f9cf19 Mon Sep 17 00:00:00 2001
From: Petr Vandrovec <vandrove@vc.cvut.cz>
Date: Mon, 6 Oct 2003 17:56:33 -0700
Subject: [PATCH] [IPV4]: Fix deadlock on ip_mc_list->lock

---
 net/ipv4/igmp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index e5f2e6f6490b4..ab0f4ca19017b 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1391,8 +1391,9 @@ int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
 	sf_markstate(pmc);
 #endif
 	if (!delta) {
+		err = -EINVAL;
 		if (!pmc->sfcount[sfmode])
-			return -EINVAL;
+			goto out_unlock;
 		pmc->sfcount[sfmode]--;
 	}
 	err = 0;
@@ -1423,6 +1424,7 @@ int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode,
 		igmp_ifc_event(pmc->interface);
 #endif
 	}
+out_unlock:
 	spin_unlock_bh(&pmc->lock);
 	return err;
 }
-- 
2.53.0