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Commit fb45459d authored by Shreyansh Chouhan's avatar Shreyansh Chouhan Committed by Greg Kroah-Hartman
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ip_gre: add validation for csum_start



[ Upstream commit 1d011c48 ]

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: c5441932 ("GRE: Refactor GRE tunneling code.")
Reported-by: default avatar <syzbot+ff8e1b9f2f36481e2efc@syzkaller.appspotmail.com>
Signed-off-by: default avatarShreyansh Chouhan <chouhan.shreyansh630@gmail.com>
Reviewed-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent e78006b5
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