Jan Höppner ebdc569a07 s390/dasd: protect device queue against concurrent access ... commit db46cd1e04 upstream. In dasd_profile_start() the amount of requests on the device queue are counted. The access to the device queue is unprotected against concurrent access. With a lot of parallel I/O, especially with alias devices enabled, the device queue can change while dasd_profile_start() is accessing the queue. In the worst case this leads to a kernel panic due to incorrect pointer accesses. Fix this by taking the device lock before accessing the queue and counting the requests. Additionally the check for a valid profile data pointer can be done earlier to avoid unnecessary locking in a hot path. Cc: <stable@vger.kernel.org> Fixes: 4fa52aa7a8 ("[S390] dasd: add enhanced DASD statistics interface") Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com> Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Link: https://lore.kernel.org/r/20231025132437.1223363-3-sth@linux.ibm.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-12-08 08:41:59 +01:00
..
block	s390/dasd: protect device queue against concurrent access	2023-12-08 08:41:59 +01:00
char	s390/zcore: fix race when reading from hardware system area	2022-08-25 11:11:25 +02:00
cio	s390/cio: unregister device when the only path is gone	2023-06-28 10:14:21 +02:00
crypto	s390/zcrypt: handle new reply code FILTERED_BY_HYPERVISOR	2020-01-04 13:59:54 +01:00
net	s390/lcs: Fix return type of lcs_start_xmit()	2023-01-18 09:26:31 +01:00
scsi	scsi: zfcp: Fix a double put in zfcp_port_enqueue()	2023-10-10 21:43:40 +02:00
virtio	virtio/s390: implement virtio-ccw revision 2 correctly	2021-03-07 11:27:42 +01:00
Makefile	…