Stefan Haberland aaba5ff274 s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup ... commit db7ba07108a48c0f95b74fabbfd5d63e924f992d upstream. Fix Oops in dasd_alias_get_start_dev() function caused by the pavgroup pointer being NULL. The pavgroup pointer is checked on the entrance of the function but without the lcu->lock being held. Therefore there is a race window between dasd_alias_get_start_dev() and _lcu_update() which sets pavgroup to NULL with the lcu->lock held. Fix by checking the pavgroup pointer with lcu->lock held. Cc: <stable@vger.kernel.org> # 2.6.25+ Fixes: 8e09f21574 ("[S390] dasd: add hyper PAV support to DASD device driver, part 1") Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Link: https://lore.kernel.org/r/20220919154931.4123002-2-sth@linux.ibm.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-09-28 11:02:57 +02:00
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block	s390/dasd: fix Oops in dasd_alias_get_start_dev due to missing pavgroup	2022-09-28 11:02:57 +02:00
char	s390/zcore: fix race when reading from hardware system area	2022-08-25 11:15:23 +02:00
cio	vfio/ccw: Do not change FSM state in subchannel event	2022-08-25 11:15:21 +02:00
crypto
net	s390/lcs: fix variable dereferenced before check	2022-05-18 09:42:48 +02:00
scsi	scsi: zfcp: Fix missing auto port scan and thus missing target ports	2022-08-25 11:15:27 +02:00
virtio	virtio/s390: implement virtio-ccw revision 2 correctly	2021-03-07 12:18:53 +01:00
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