| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 63/74] net: igmp: fix source address check for IGMPv3 reports | Date | Mon, 29 Jan 2018 13:57:08 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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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 @@ -338,7 +338,7 @@ 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);
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