tree 4a1f5079a0345baaee566ad60dc134fb3be704d5
parent 12d125b4574bd7f602802d94d7b4a55d85aa8e25
author Shreyansh Chouhan <chouhan.shreyansh630@gmail.com> 1629530064 +0530
committer David S. Miller <davem@davemloft.net> 1629663880 +0100

ip_gre: add validation for csum_start

Validate csum_start in gre_handle_offloads before we call _gre_xmit so
that we do not crash later when the csum_start value is used in the
lco_csum function call.

This patch deals with ipv4 code.

Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.")
Reported-by: syzbot+ff8e1b9f2f36481e2efc@syzkaller.appspotmail.com
Signed-off-by: Shreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>