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Ming Lei fb350e0ad9 blk-mq: fix race between updating nr_hw_queues and switching io sched 
In both elevator_switch_mq() and blk_mq_update_nr_hw_queues(), sched tags
can be allocated, and q->nr_hw_queue is used, and race is inevitable, for
example: blk_mq_init_sched() may trigger use-after-free on hctx, which is
freed in blk_mq_realloc_hw_ctxs() when nr_hw_queues is decreased.

This patch fixes the race be holding q->sysfs_lock.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Tested-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-01-06 09:25:36 -07:00
..
partitions
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
badblocks.c
badblocks: fix wrong return value in badblocks_set if badblocks are disabled
2017-11-03 11:29:50 -07:00
bfq-cgroup.c
block, bfq: move debug blkio stats behind CONFIG_DEBUG_BLK_CGROUP
2017-11-14 20:13:33 -07:00
bfq-iosched.c
block, bfq: remove batches of confusing ifdefs
2018-01-05 09:32:59 -07:00
bfq-iosched.h
block, bfq: let a queue be merged only shortly after starting I/O
2018-01-05 09:26:09 -07:00
bfq-wf2q.c
block, bfq: let a queue be merged only shortly after starting I/O
2018-01-05 09:26:09 -07:00
bio-integrity.c
block: remove unnecessary NULL checks in bioset_integrity_free()
2017-10-06 13:03:12 -06:00
bio.c
block: move bio_alloc_pages() to bcache
2018-01-06 09:18:00 -07:00
blk-cgroup.c
blkcg: add sanity check for blkcg policy operations
2017-11-04 12:31:15 -06:00
blk-core.c
blk-mq: quiesce queue before freeing queue
2018-01-06 09:25:36 -07:00
blk-exec.c
block: introduce new block status code type
2017-06-09 09:27:32 -06:00
blk-flush.c
blk-mq: don't allocate driver tag upfront for flush rq
2017-11-04 12:40:13 -06:00
blk-integrity.c
block: switch bios to blk_status_t
2017-06-09 09:27:32 -06:00
blk-ioc.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-lib.c
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
blk-map.c
Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2017-11-17 12:08:18 -08:00
blk-merge.c
block: blk-merge: remove unnecessary check
2018-01-06 09:18:00 -07:00
blk-mq-cpumap.c
blk-mq: map queues to all present CPUs
2017-07-24 10:01:31 -06:00
blk-mq-debugfs.c
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
blk-mq-debugfs.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-mq-pci.c
blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL
2017-08-18 08:08:14 -06:00
blk-mq-rdma.c
block: Add rdma affinity based queue mapping helper
2017-08-08 14:58:03 -04:00
blk-mq-sched.c
blk-mq: remove confusing comment of blk_mq_sched_dispatch_requests
2018-01-05 08:36:33 -07:00
blk-mq-sched.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-mq-sysfs.c
blk-mq: untangle debugfs and sysfs
2017-05-04 08:24:13 -06:00
blk-mq-tag.c
blk-mq: improve heavily contended tag case
2017-12-22 11:09:37 -07:00
blk-mq-tag.h
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
blk-mq-virtio.c
blk-mq: provide a default queue mapping for virtio device
2017-02-27 20:54:05 +02:00
blk-mq.c
blk-mq: fix race between updating nr_hw_queues and switching io sched
2018-01-06 09:25:36 -07:00
blk-mq.h
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
blk-settings.c
block: remove __bio_kmap_atomic
2017-11-10 19:53:25 -07:00
blk-softirq.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-stat.c
treewide: setup_timer() -> timer_setup()
2017-11-21 15:57:07 -08:00
blk-stat.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-sysfs.c
blk-sysfs: remove NULL pointer checking in queue_wb_lat_store
2017-11-23 22:00:17 -07:00
blk-tag.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-throttle.c
treewide: setup_timer() -> timer_setup()
2017-11-21 15:57:07 -08:00
blk-timeout.c
block: Fix a race between blk_cleanup_queue() and timeout handling
2017-10-30 13:28:10 -06:00
blk-wbt.c
blk-wbt: fix comments typo
2017-11-23 22:00:20 -07:00
blk-wbt.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
blk-zoned.c
block: introduce zoned block devices zone write locking
2018-01-05 09:22:17 -07:00
blk.h
Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block
2017-11-14 15:32:19 -08:00
bounce.c
block: bounce: don't access bio->bi_io_vec in copy_to_high_bio_irq
2018-01-06 09:18:00 -07:00
bsg-lib.c
bsg-lib: fix use-after-free under memory-pressure
2017-10-04 08:35:04 -06:00
bsg.c
block: pass full fmode_t to blk_verify_command
2017-11-10 19:53:25 -07:00
cfq-iosched.c
block/cfq: cache rightmost rb_node
2017-09-08 18:26:49 -07:00
cmdline-parser.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compat_ioctl.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
deadline-iosched.c
deadline-iosched: Introduce zone locking support
2018-01-05 09:22:17 -07:00
elevator.c
blk-mq: quiesce queue during switching io sched and updating nr_requests
2018-01-06 09:25:36 -07:00
genhd.c
block: genhd.c: fix message typo
2017-11-19 11:02:19 -07:00
ioctl.c
block: move CAP_SYS_ADMIN check in blkdev_roset()
2017-10-25 12:25:00 -06:00
ioprio.c
block: Add fallthrough markers to switch statements
2017-06-21 11:46:07 -06:00
Kconfig
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
Kconfig.iosched
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kyber-iosched.c
block: kyber: check if there are requests in ctx in kyber_has_work()
2017-11-01 08:20:02 -06:00
Makefile
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mq-deadline.c
mq-deadline: make it clear that __dd_dispatch_request() works on all hw queues
2018-01-06 09:23:11 -07:00
noop-iosched.c
block: move existing elevator ops to union
2017-01-17 10:03:33 -07:00
opal_proto.h
block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled
2017-09-11 09:45:52 -06:00
partition-generic.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
scsi_ioctl.c
block: pass full fmode_t to blk_verify_command
2017-11-10 19:53:25 -07:00
sed-opal.c
block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled
2017-09-11 09:45:52 -06:00
t10-pi.c
t10-pi: Move opencoded contants to common header
2017-07-03 16:56:25 -06:00