This is a note to let you know that I've just added the patch titled
net: avoid skb_warn_bad_offload on IS_ERR
to the 4.9-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-avoid-skb_warn_bad_offload-on-is_err.patch and it can be found in the queue-4.9 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 8d74e9f88d65af8bb2e095aff506aa6eac755ada Mon Sep 17 00:00:00 2001
From: Willem de Bruijn willemb@google.com Date: Tue, 12 Dec 2017 11:39:04 -0500 Subject: net: avoid skb_warn_bad_offload on IS_ERR
From: Willem de Bruijn willemb@google.com
commit 8d74e9f88d65af8bb2e095aff506aa6eac755ada upstream.
skb_warn_bad_offload warns when packets enter the GSO stack that require skb_checksum_help or vice versa. Do not warn on arbitrary bad packets. Packet sockets can craft many. Syzkaller was able to demonstrate another one with eth_type games.
In particular, suppress the warning when segmentation returns an error, which is for reasons other than checksum offload.
See also commit 36c92474498a ("net: WARN if skb_checksum_help() is called on skb requiring segmentation") for context on this warning.
Signed-off-by: Willem de Bruijn willemb@google.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/core/dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/core/dev.c +++ b/net/core/dev.c @@ -2763,7 +2763,7 @@ struct sk_buff *__skb_gso_segment(struct
segs = skb_mac_gso_segment(skb, features);
- if (unlikely(skb_needs_check(skb, tx_path))) + if (unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs))) skb_warn_bad_offload(skb);
return segs;
Patches currently in stable-queue which might be from willemb@google.com are
queue-4.9/net-avoid-skb_warn_bad_offload-on-is_err.patch