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Colin Ian King f0fba398fe block: avoid null pointer dereference on null disk 
It is possible that the pointer disk can be null and hence
we can get a null pointer deference when accessing disk->flags.
Add a null pointer check to avoid the dereference.

Detected by CoverityScan, CID#1461133 ("Explicit null dereferenced")

Fixes: 8ddcd653257c ("block: introduce GENHD_FL_HIDDEN")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2017-11-10 19:55:57 -07:00
..
partitions
partitions/ldm: switch to use uuid_t
2017-06-05 16:59:14 +02:00
badblocks.c
block: Add fallthrough markers to switch statements
2017-06-21 11:46:07 -06:00
bfq-cgroup.c
bfq: Declare local functions static
2017-09-01 13:56:37 -06:00
bfq-iosched.c
block, bfq: fix unbalanced decrements of burst size
2017-10-09 09:54:58 -06:00
bfq-iosched.h
Merge branch 'for-4.14/block' of git://git.kernel.dk/linux-block
2017-09-07 11:59:42 -07:00
bfq-wf2q.c
block, bfq: guarantee update_next_in_service always returns an eligible entity
2017-08-31 08:20:31 -06:00
bio-integrity.c
block: remove unnecessary NULL checks in bioset_integrity_free()
2017-10-06 13:03:12 -06:00
bio.c
block: fix Sphinx kernel-doc warning
2017-10-16 13:00:12 -06:00
blk-cgroup.c
blkcg: add sanity check for blkcg policy operations
2017-11-04 12:31:15 -06:00
blk-core.c
block, nvme: Introduce blk_mq_req_flags_t
2017-11-10 19:53:25 -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
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
2017-03-03 10:53:35 -08:00
blk-lib.c
block: cope with WRITE ZEROES failing in blkdev_issue_zeroout()
2017-10-25 12:28:23 -06:00
blk-map.c
blk-map: call blk_queue_bounce from blk_rq_append_bio
2017-06-27 12:13:21 -06:00
blk-merge.c
block: replace bi_bdev with a gendisk pointer and partitions index
2017-08-23 12:49:55 -06:00
blk-mq-cpumap.c
blk-mq: map queues to all present CPUs
2017-07-24 10:01:31 -06:00
blk-mq-debugfs.c
block: Add the QUEUE_FLAG_PREEMPT_ONLY request queue flag
2017-11-10 19:53:25 -07:00
blk-mq-debugfs.h
mq-deadline: add debugfs attributes
2017-05-04 08:25:17 -06:00
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
Revert "blk-mq: don't handle TAG_SHARED in restart"
2017-11-10 19:53:25 -07:00
blk-mq-sched.h
blk-mq: don't restart queue when .get_budget returns BLK_STS_RESOURCE
2017-11-01 08:20:34 -06:00
blk-mq-sysfs.c
blk-mq: untangle debugfs and sysfs
2017-05-04 08:24:13 -06:00
blk-mq-tag.c
block: remove blk_mq_reinit_tagset
2017-10-18 19:27:49 +02:00
blk-mq-tag.h
blk-mq-tag: kill unused tag enums
2017-10-01 01:26:21 -06:00
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
block, nvme: Introduce blk_mq_req_flags_t
2017-11-10 19:53:25 -07:00
blk-mq.h
block, nvme: Introduce blk_mq_req_flags_t
2017-11-10 19:53:25 -07:00
blk-settings.c
block: remove __bio_kmap_atomic
2017-11-10 19:53:25 -07:00
blk-softirq.c
smp: Avoid using two cache lines for struct call_single_data
2017-08-29 15:14:38 +02:00
blk-stat.c
blk-stat: delete useless code
2017-10-10 13:48:14 -06:00
blk-stat.h
blk-stat: kill blk_stat_rq_ddir()
2017-04-21 07:56:23 -06:00
blk-sysfs.c
block: fix warning when I/O elevator is changed as request_queue is being removed
2017-08-28 10:52:44 -06:00
blk-tag.c
block: Unexport blk_queue_end_tag()
2017-08-18 08:36:58 -06:00
blk-throttle.c
blk-throttle: fix null pointer dereference while throttling writeback IOs
2017-10-10 13:09:34 -06:00
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
block,bfq: Disable writeback throttling
2017-10-09 08:29:21 -06:00
blk-wbt.h
block: Make writeback throttling defaults consistent for SQ devices
2017-04-19 08:49:03 -06:00
blk-zoned.c
block: replace bi_bdev with a gendisk pointer and partitions index
2017-08-23 12:49:55 -06:00
blk.h
blk-mq: document the need to have STARTED and COMPLETED share a byte
2017-10-04 11:22:24 -06:00
bounce.c
block: remove the queue_bounce_pfn helper
2017-06-27 12:13:45 -06:00
bsg-lib.c
bsg-lib: don't free job in bsg_prepare_job
2017-09-25 08:56:05 -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
block: remove unrelated header files and export symbol
2014-01-21 20:18:26 -08:00
compat_ioctl.c
compat_hdio_ioctl: Fix a declaration
2017-08-31 17:32:41 -04:00
deadline-iosched.c
block, scheduler: convert xxx_var_store to void
2017-08-28 10:01:08 -06:00
elevator.c
elevator: allow name aliases
2017-10-25 12:36:50 -06:00
genhd.c
block: avoid null pointer dereference on null disk
2017-11-10 19:55:57 -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
block: Add rdma affinity based queue mapping helper
2017-08-08 14:58:03 -04:00
Kconfig.iosched
block, bfq: add full hierarchical scheduling and cgroups support
2017-04-19 08:30:26 -06:00
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
block: Add rdma affinity based queue mapping helper
2017-08-08 14:58:03 -04:00
mq-deadline.c
mq-deadline: add 'deadline' as a name alias
2017-10-25 12:36:55 -06:00
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
block: fix a crash caused by wrong API
2017-09-25 08:56:05 -06:00
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