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linux/net/iucv
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Hidayath Khan 47a5116e56 net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() 
afiucv_hs_callback_syn() allocates the child socket with GFP_ATOMIC.
If the allocation fails, nsk is NULL.

The connection-refused path is entered when the listen state check
fails, the accept backlog is full, or nsk is NULL. The code
unconditionally calls iucv_sock_kill(nsk) in that path.

iucv_sock_kill() does not accept a NULL socket pointer and immediately
dereferences sk via sock_flag(sk, SOCK_ZAPPED). When nsk is NULL,
calling iucv_sock_kill(nsk) results in a NULL pointer dereference.

Only call iucv_sock_kill() when a child socket was successfully
allocated.

Fixes: 3881ac441f ("af_iucv: add HiperSockets transport")
Cc: stable@vger.kernel.org
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Hidayath Khan <hidayath@linux.ibm.com>
Link: https://patch.msgid.link/20260709191732.124092-1-hidayath@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-07-21 13:36:35 -07:00
..
af_iucv.c net/af_iucv: fix NULL deref in afiucv_hs_callback_syn() 2026-07-21 13:36:35 -07:00
iucv.c net/iucv: Add missing kernel-doc return value descriptions 2026-03-31 20:14:56 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00