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mirror-linux/net/iucv
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Breno Leitao 3589d20a66 net/iucv: fix locking in .getsockopt 
Mirror iucv_sock_setsockopt() and wrap the whole switch in
lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock
becomes redundant and is removed.

Any AF_IUCV HIPER user can potentially crash the kernel by racing
recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences
iucv->hs_dev->mtu after iucv_sock_close() (called from the racing
recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference
oops.

Suggested-by: Stanislav Fomichev <sdf.kernel@gmail.com>
Fixes: 51363b8751 ("af_iucv: allow retrieval of maximum message size")
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Tested-by: Alexandra Winter <wintera@linux.ibm.com>
Link: https://patch.msgid.link/20260521-af_iucv_fix2-v1-1-f16b1c510aa9@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
 		2026-05-22 17:40:32 -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
af_iucv.c net/iucv: fix locking in .getsockopt 2026-05-22 17:40:32 -07:00
iucv.c net/iucv: Add missing kernel-doc return value descriptions 2026-03-31 20:14:56 -07:00