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Jan Höppner 6062c527d0 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>

2023-12-03 07:31:24 +01:00

block

s390/dasd: protect device queue against concurrent access

2023-12-03 07:31:24 +01:00

char

s390/zcore: fix race when reading from hardware system area

2022-08-17 14:24:10 +02:00

cio

s390/cio: fix a memleak in css_alloc_subchannel

2023-10-25 11:59:03 +02:00

crypto

s390/ap: fix AP bus crash on early config change callback invocation