Stefan Haberland 53563ca57c s390/dasd: fix list corruption of lcu list ... commit 53a7f65583 upstream. In dasd_alias_disconnect_device_from_lcu the device is removed from any list on the LCU. Afterwards the LCU is removed from the lcu list if it does not contain devices any longer. The lcu->lock protects the lcu from parallel updates. But to cancel all workers and wait for completion the lcu->lock has to be unlocked. If two devices are removed in parallel and both are removed from the LCU the first device that takes the lcu->lock again will delete the LCU because it is already empty but the second device also tries to free the LCU which leads to a list corruption of the lcu list. Fix by removing the device right before the lcu is checked without unlocking the lcu->lock in between. Fixes: 8e09f21574 ("[S390] dasd: add hyper PAV support to DASD device driver, part 1") Cc: stable@vger.kernel.org Signed-off-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-12-30 11:26:10 +01:00
..
block	s390/dasd: fix list corruption of lcu list	2020-12-30 11:26:10 +01:00
char	s390/kasan: avoid instrumentation of early C code	2019-11-24 08:20:44 +01:00
cio	s390/cio: add cond_resched() in the slow_eval_known_fn() loop	2020-09-03 11:24:24 +02:00
crypto	s390/zcrypt: Fix ZCRYPT_PERDEV_REQCNT ioctl	2020-10-01 13:14:54 +02:00
net	s390/qeth: fix tear down of async TX buffers	2020-12-02 08:48:11 +01:00
scsi	scsi: zfcp: Fix use-after-free in request timeout handlers	2020-08-26 10:30:59 +02:00
virtio	virtio/s390: fix race on airq_areas[]	2019-09-16 08:22:23 +02:00
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