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

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

thanks, Sebastian

Am 28.01.2018 um 17:39 schrieb gregkh@linuxfoundation.org:

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%3Ba=su...

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 stable@vger.kernel.org know about it.

From foo@baz Sun Jan 28 17:35:08 CET 2018 From: Felix Fietkau nbd@nbd.name Date: Fri, 19 Jan 2018 11:50:46 +0100 Subject: net: igmp: fix source address check for IGMPv3 reports

From: Felix Fietkau nbd@nbd.name

[ 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 cernekee@chromium.org Fixes: a46182b00290 ("net: igmp: Use correct source address on IGMPv3 reports") Reported-by: Sebastian Gottschall s.gottschall@dd-wrt.com Signed-off-by: Felix Fietkau nbd@nbd.name Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

---

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

--- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -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 nbd@nbd.name are

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