Patch "net: igmp: fix source address check for IGMPv3 reports" has been added to the 4.14-stable tree

From foo@baz Sun Jan 28 17:35:08 CET 2018

This is a note to let you know that I've just added the patch titled

net: igmp: fix source address check for IGMPv3 reports

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
net-igmp-fix-source-address-check-for-igmpv3-reports.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From foo@baz Sun Jan 28 17:35:08 CET 2018
From: Felix Fietkau <[email protected]>
Date: Fri, 19 Jan 2018 11:50:46 +0100
Subject: net: igmp: fix source address check for IGMPv3 reports

From: Felix Fietkau <[email protected]>

[ Upstream commit ad23b750933ea7bf962678972a286c78a8fa36aa ]

Commit "net: igmp: Use correct source address on IGMPv3 reports" introduced a check to validate the source address of locally generated IGMPv3 packets.
Instead of checking the local interface address directly, it uses inet_ifa_match(fl4->saddr, ifa), which checks if the address is on the local subnet (or equal to the point-to-point address if used).

This breaks for point-to-point interfaces, so check against ifa->ifa_local directly.

Cc Kevin Cernekee <[email protected]>

Fixes a46182b00290 ("net: igmp: Use correct source address on IGMPv3 reports")

Reported-by Sebastian Gottschall <[email protected]>

Signed-off-by Felix Fietkau <[email protected]>

Signed-off-by David S. Miller <[email protected]>

Signed-off-by Greg Kroah-Hartman <[email protected]>

---
  net/ipv4/igmp.c |    2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

net/ipv4/igmp.c +1 -1

@@ -332,7 +332,7 @@ static __be32 igmpv3_get_srcaddr(struct
  		return htonl(INADDR_ANY);
 
  	for_ifa(in_dev) {
-		if (inet_ifa_match(fl4->saddr, ifa))
+		if (fl4->saddr == ifa->ifa_local)
  			return fl4->saddr;
  	} endfor_ifa(in_dev);
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/net-igmp-fix-source-address-check-for-igmpv3-reports.patch

please apply that patch to 4.4 and 3.18 as well. they are affected by this regression