net: avoid skb_warn_bad_offload on IS_ERR

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commit 8d74e9f88d 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 36c9247449 ("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>

...

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Willem de Bruijn 2017-12-12 11:39:04 -05:00 • committed by Greg Kroah-Hartman

parent 83ee02de2c

commit 701ba0df95

1 changed files with 1 additions and 1 deletions

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net/core/dev.c

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