tree 1886091dc16fcc786465ff77fa97e75421f37d15
parent 4dc0159458d607c8ccf36ba91a262d7bba7d4bbc
author Willem de Bruijn <willemb@google.com> 1513096744 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1519553143 +0100

net: avoid skb_warn_bad_offload on IS_ERR

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>