This is a note to let you know that I've just added the patch titled ipv4: Fix traffic triggered IPsec connections. to the 4.13-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: ipv4-fix-traffic-triggered-ipsec-connections.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Wed Nov 15 17:25:34 CET 2017 From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> Date: Mon, 9 Oct 2017 08:43:55 +0200 Subject: ipv4: Fix traffic triggered IPsec connections. From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> [ Upstream commit 6c0e7284d89995877740d8a26c3e99a937312a3c ] A recent patch removed the dst_free() on the allocated dst_entry in ipv4_blackhole_route(). The dst_free() marked the dst_entry as dead and added it to the gc list. I.e. it was setup for a one time usage. As a result we may now have a blackhole route cached at a socket on some IPsec scenarios. This makes the connection unusable. Fix this by marking the dst_entry directly at allocation time as 'dead', so it is used only once. Fixes: b838d5e1c5b6 ("ipv4: mark DST_NOGC and remove the operation of dst_free()") Reported-by: Tobias Brunner <tobias@xxxxxxxxxxxxxx> Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/ipv4/route.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -2507,7 +2507,7 @@ struct dst_entry *ipv4_blackhole_route(s struct rtable *ort = (struct rtable *) dst_orig; struct rtable *rt; - rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_NONE, 0); + rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, 1, DST_OBSOLETE_DEAD, 0); if (rt) { struct dst_entry *new = &rt->dst; Patches currently in stable-queue which might be from steffen.klassert@xxxxxxxxxxx are queue-4.13/ipv6-fix-traffic-triggered-ipsec-connections.patch queue-4.13/ipv4-fix-traffic-triggered-ipsec-connections.patch