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

vrf: Fix use after free and double free in vrf_finish_output

to the 4.15-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: vrf-fix-use-after-free-and-double-free-in-vrf_finish_output.patch and it can be found in the queue-4.15 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 Tue Apr 10 23:19:36 CEST 2018

From: David Ahern dsahern@gmail.com Date: Thu, 29 Mar 2018 12:49:52 -0700 Subject: vrf: Fix use after free and double free in vrf_finish_output

From: David Ahern dsahern@gmail.com

[ Upstream commit 82dd0d2a9a76fc8fa2b18d80b987d455728bf83a ]

Miguel reported an skb use after free / double free in vrf_finish_output when neigh_output returns an error. The vrf driver should return after the call to neigh_output as it takes over the skb on error path as well.

Patch is a simplified version of Miguel's patch which was written for 4.9, and updated to top of tree.

Fixes: 8f58336d3f78a ("net: Add ethernet header for pass through VRF device") Signed-off-by: Miguel Fadon Perlines mfadon@teldat.com Signed-off-by: David Ahern dsahern@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/vrf.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -578,12 +578,13 @@ static int vrf_finish_output(struct net if (!IS_ERR(neigh)) { sock_confirm_neigh(skb, neigh); ret = neigh_output(neigh, skb); + rcu_read_unlock_bh(); + return ret; }

rcu_read_unlock_bh(); err: - if (unlikely(ret < 0)) - vrf_tx_error(skb->dev, skb); + vrf_tx_error(skb->dev, skb); return ret; }

Patches currently in stable-queue which might be from dsahern@gmail.com are

queue-4.15/perf-evsel-fix-swap-for-samples-with-raw-data.patch queue-4.15/perf-tools-fix-copyfile_offset-update-of-output-offset.patch queue-4.15/net-ipv6-fix-route-leaking-between-vrfs.patch queue-4.15/vrf-fix-use-after-free-and-double-free-in-vrf_finish_output.patch