1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index fbc53767bf35..313ad93d2f7b 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1721,7 +1721,8 @@ 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)) {