Stefan Haberland 983e7f3521 s390/dasd: fix list corruption of lcu list ... commit 53a7f655834c7c335bf683f248208d4fbe4b47bc 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 11:54:09 +01:00
..
block	s390/dasd: fix list corruption of lcu list	2020-12-30 11:54:09 +01:00
char	s390 updates for the 5.10 merge window	2020-10-16 12:36:38 -07:00
cio	s390/cio: fix use-after-free in ccw_device_destroy_console	2020-12-30 11:53:46 +01:00
crypto	s390/pkey: fix paes selftest failure with paes and pkey static build	2020-11-03 15:12:16 +01:00
net	s390/qeth: fix tear down of async TX buffers	2020-11-20 18:59:48 -08:00
scsi	s390 updates for the 5.10 merge window	2020-10-16 12:36:38 -07:00
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