From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: Wed, 4 Jan 2023 21:18:44 +0100
Subject: [PATCH] can: isotp: check CAN address family in isotp_bind()
References: bsc#1012628
Patch-mainline: 6.2.3
Git-commit: c6adf659a8ba85913e16a571d5a9bcd17d3d1234
[ 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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
net/can/isotp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/can/isotp.c b/net/can/isotp.c
index fc81d777..9bc34485 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -1220,6 +1220,9 @@ static int isotp_bind(struct socket *sock, struct sockaddr *uaddr, int len)
if (len < ISOTP_MIN_NAMELEN)
return -EINVAL;
+ if (addr->can_family != AF_CAN)
+ return -EINVAL;
+
/* sanitize tx CAN identifier */
if (tx_id & CAN_EFF_FLAG)
tx_id &= (CAN_EFF_FLAG | CAN_EFF_MASK);
--
2.35.3