can: isotp: check CAN address family in isotp_bind()
authorOliver Hartkopp <socketcan@hartkopp.net>
Wed, 4 Jan 2023 20:18:44 +0000 (21:18 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 10 Mar 2023 08:33:51 +0000 (09:33 +0100)
commit9427584c2f153d0677ef3bad6f44028c60d728c4
tree02f796c406c9019f959072757d90c3ca3dabefa0
parent3b26e45ce1e156559ff72dcaa15f9e7d99c60497
can: isotp: check CAN address family in isotp_bind()

[ Upstream commit c6adf659a8ba85913e16a571d5a9bcd17d3d1234 ]

Add missing check to block non-AF_CAN binds.

Syzbot created some code which matched the right sockaddr struct size
but used AF_XDP (0x2C) instead of AF_CAN (0x1D) in the address family
field:

bind$xdp(r2, &(0x7f0000000540)={0x2c, 0x0, r4, 0x0, r2}, 0x10)
                                ^^^^
This has no funtional impact but the userspace should be notified about
the wrong address family field content.

Link: https://syzkaller.appspot.com/text?tag=CrashLog&x=11ff9d8c480000
Reported-by: syzbot+5aed6c3aaba661f5b917@syzkaller.appspotmail.com
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/all/20230104201844.13168-1-socketcan@hartkopp.net
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
net/can/isotp.c