Subject: v2 [PATCH net-next 4/7] ipv6: Check return of dev_set_allmulti

From: Wang Chen <[email-masked]>
Date: Tue, 01 Jul 2008 11:26:39 +0800

allmulti might overflow.
Commit: "netdevice: Fix promiscuity and allmulti overflow" in net-next makes
dev_set_promiscuity/allmulti return error number if overflow happened.

Here, we check the positive increment for allmulti to get error return.

Signed-off-by: Wang Chen <[email-masked]>
---
 net/ipv6/ip6mr.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 1479618..3e2d964 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -603,6 +603,7 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
 	int vifi = vifc->mif6c_mifi;
 	struct mif_device *v = &vif6_table[vifi];
 	struct net_device *dev;
+	int err;
 
 	/* Is vif busy ? */
 	if (MIF_EXISTS(vifi))
@@ -632,7 +633,9 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
 		return -EINVAL;
 	}
 
-	dev_set_allmulti(dev, 1);
+	err = dev_set_allmulti(dev, 1);
+	if (err)
+		return err;
 
 	/*
 	 *	Fill in the VIF structures
-- 1.5.3.4