kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00
Code Issues Releases Packages Activity

can: dev: init_can_skb(): restore skb header initialization

Browse source 
Commit 9f10374bb0 ("can: remove private CAN skb headroom infrastructure")
removed the skb_reset_mac_header()/skb_reset_network_header()/
skb_reset_transport_header() calls from init_can_skb(). As a result, RX
skbs from alloc_can_skb() and friends again carry mac_header = 0xFFFF.
When such an skb reaches packet_rcv_spkt() (SOCK_PACKET), the push length
calculation overflows and triggers skb_under_panic -> kernel BUG -> full
machine panic.

The same issue was originally reported in 2014 on linux-can and fixed by
commit 969439016d ("can: add missing initialisations in CAN related
skbuffs"). packet_rcv_spkt() itself has never been hardened: only
packet_rcv() and tpacket_rcv() gained dev_has_header() checks in
commit d549699048 ("net/packet: fix packet receive on L3 devices
without visible hard header").

Fixes: 9f10374bb0 ("can: remove private CAN skb headroom infrastructure")
Cc: stable@vger.kernel.org
Reviewed-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: zjamg <ndaugoing@gmail.com>
Tested-by: Quchaosheng <quchaosheng000406@163.com>
Link: https://patch.msgid.link/20260917123716.63116-1-ndaugoing@gmail.com
Reported-by: Shaunak Datar <shaunakkdatar@gmail.com>
Closes: https://lore.kernel.org/all/20260918151606.765490-1-shaunakkdatar@gmail.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
zjamg 2026-09-17 20:37:16 +08:00 • committed by Marc Kleine-Budde
commit 0a04c0cb86
1 changed files with 4 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files