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Dongsheng Yang 7e59c506c3 bcache: check c->root with IS_ERR_OR_NULL() in mca_reserve() 
In mca_reserve(c) macro, we are checking root whether is NULL or not.
But that's not enough, when we read the root node in run_cache_set(),
if we got an error in bch_btree_node_read_done(), we will return
ERR_PTR(-EIO) to c->root.

And then we will go continue to unregister, but before calling
unregister_shrinker(&c->shrink), there is a possibility to call
bch_mca_count(), and we would get a crash with call trace like that:

[ 2149.876008] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b5
... ...
[ 2150.598931] Call trace:
[ 2150.606439]  bch_mca_count+0x58/0x98 [escache]
[ 2150.615866]  do_shrink_slab+0x54/0x310
[ 2150.624429]  shrink_slab+0x248/0x2d0
[ 2150.632633]  drop_slab_node+0x54/0x88
[ 2150.640746]  drop_slab+0x50/0x88
[ 2150.648228]  drop_caches_sysctl_handler+0xf0/0x118
[ 2150.657219]  proc_sys_call_handler.isra.18+0xb8/0x110
[ 2150.666342]  proc_sys_write+0x40/0x50
[ 2150.673889]  __vfs_write+0x48/0x90
[ 2150.681095]  vfs_write+0xac/0x1b8
[ 2150.688145]  ksys_write+0x6c/0xd0
[ 2150.695127]  __arm64_sys_write+0x24/0x30
[ 2150.702749]  el0_svc_handler+0xa0/0x128
[ 2150.710296]  el0_svc+0x8/0xc

Signed-off-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-10-02 14:25:29 -06:00
..
bcache
bcache: check c->root with IS_ERR_OR_NULL() in mca_reserve()
2020-10-02 14:25:29 -06:00
persistent-data
dm thin metadata: Fix use-after-free in dm_bm_set_read_only
2020-09-02 13:38:40 -04:00
dm-bio-prison-v1.c
dm bio prison: replace spin_lock_irqsave with spin_lock_irq
2019-11-05 14:53:03 -05:00
dm-bio-prison-v1.h
…
dm-bio-prison-v2.c
dm bio prison v2: use true/false for bool variable
2020-01-07 12:07:08 -05:00
dm-bio-prison-v2.h
…
dm-bio-record.h
dm bio record: save/restore bi_end_io and bi_integrity
2020-03-03 10:02:46 -05:00
dm-bufio.c
dm bufio: do buffer cleanup from a workqueue
2020-07-20 11:17:43 -04:00
dm-builtin.c
…
dm-cache-background-tracker.c
…
dm-cache-background-tracker.h
…
dm-cache-block-types.h
…
dm-cache-metadata.c
dm cache metadata: Avoid returning cmd->bm wild pointer on error
2020-09-02 13:38:24 -04:00
dm-cache-metadata.h
…
dm-cache-policy-internal.h
…
dm-cache-policy-smq.c
…
dm-cache-policy.c
…
dm-cache-policy.h
…
dm-cache-target.c
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
dm-clone-metadata.c
dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions()
2020-03-27 14:42:51 -04:00
dm-clone-metadata.h
dm clone metadata: Fix return type of dm_clone_nr_of_hydrated_regions()
2020-03-27 14:42:51 -04:00
dm-clone-target.c
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
dm-core.h
…
dm-crypt.c
dm crypt: Initialize crypto wait structures
2020-09-01 16:41:57 -04:00
dm-delay.c
block: rename generic_make_request to submit_bio_noacct
2020-07-01 07:27:24 -06:00
dm-dust.c
dm dust: add interface to list all badblocks
2020-07-20 11:17:41 -04:00
dm-ebs-target.c
dm ebs: Fix incorrect checking for REQ_OP_FLUSH
2020-08-04 16:01:40 -04:00
dm-era-target.c
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
dm-exception-store.c
…
dm-exception-store.h
- Improve DM snapshot target's scalability by using finer grained
2019-05-16 15:55:48 -07:00
dm-flakey.c
block: rework zone reporting
2019-11-12 19:12:07 -07:00
dm-historical-service-time.c
dm mpath: add Historical Service Time Path Selector
2020-05-15 10:29:36 -04:00
dm-init.c
dm init: Set file local variable static
2020-08-04 15:51:28 -04:00
dm-integrity.c
dm integrity: fix error reporting in bitmap mode after creation
2020-09-01 16:41:57 -04:00
dm-io.c
treewide: Remove uninitialized_var() usage
2020-07-16 12:35:15 -07:00
dm-ioctl.c
- DM multipath locking fixes around m->flags tests and improvements to
2020-08-07 13:08:09 -07:00
dm-kcopyd.c
dm kcopyd: always complete failed jobs
2019-08-15 15:57:39 -04:00
dm-linear.c
dm,dax: Add dax zero_page_range operation
2020-04-02 19:15:03 -07:00
dm-log-userspace-base.c
…
dm-log-userspace-transfer.c
…
dm-log-userspace-transfer.h
…
dm-log-writes.c
dm: replace zero-length array with flexible-array
2020-05-20 17:09:44 -04:00
dm-log.c
…
dm-mpath.c
dm mpath: fix racey management of PG initialization
2020-09-01 16:41:56 -04:00
dm-mpath.h
…
dm-path-selector.c
…
dm-path-selector.h
dm mpath: pass IO start time to path selector
2020-05-15 10:29:36 -04:00
dm-queue-length.c
dm mpath: pass IO start time to path selector
2020-05-15 10:29:36 -04:00
dm-raid1.c
block: rename generic_make_request to submit_bio_noacct
2020-07-01 07:27:24 -06:00
dm-raid.c
block: add a new revalidate_disk_size helper
2020-09-02 08:00:07 -06:00
dm-region-hash.c
…
dm-round-robin.c
…
dm-rq.c
- DM multipath locking fixes around m->flags tests and improvements to
2020-08-07 13:08:09 -07:00
dm-rq.h
…
dm-service-time.c
dm mpath: pass IO start time to path selector
2020-05-15 10:29:36 -04:00
dm-snap-persistent.c
Remove uninitialized_var() macro for v5.9-rc1
2020-08-04 13:49:43 -07:00
dm-snap-transient.c
…
dm-snap.c
block: rename generic_make_request to submit_bio_noacct
2020-07-01 07:27:24 -06:00
dm-stats.c
dm: replace zero-length array with flexible-array
2020-05-20 17:09:44 -04:00
dm-stats.h
…
dm-stripe.c
dm: replace zero-length array with flexible-array
2020-05-20 17:09:44 -04:00
dm-switch.c
dm: replace zero-length array with flexible-array
2020-05-20 17:09:44 -04:00
dm-sysfs.c
…
dm-table.c
Merge branch 'for-5.10/block' into for-5.10/drivers
2020-09-24 13:44:39 -06:00
dm-target.c
…
dm-thin-metadata.c
dm thin metadata: Fix use-after-free in dm_bm_set_read_only
2020-09-02 13:38:40 -04:00
dm-thin-metadata.h
dm thin metadata: Add support for a pre-commit callback
2019-12-05 17:05:24 -05:00
dm-thin.c
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
dm-uevent.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
dm-uevent.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
dm-unstripe.c
…
dm-verity-fec.c
dm verity fec: fix hash block number in verity_fec_decode
2020-04-16 16:16:38 -04:00
dm-verity-fec.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
dm-verity-target.c
- DM multipath locking fixes around m->flags tests and improvements to
2020-08-07 13:08:09 -07:00
dm-verity-verify-sig.c
dm verity: add root hash pkcs#7 signature verification
2019-08-23 10:13:14 -04:00
dm-verity-verify-sig.h
dm verity: Fix compilation warning
2020-08-04 15:48:13 -04:00
dm-verity.h
dm verity: add "panic_on_corruption" error handling mode
2020-07-13 11:47:33 -04:00
dm-writecache.c
dm writecache: handle DAX to partitions on persistent memory correctly
2020-09-01 16:41:55 -04:00
dm-zero.c
…
dm-zoned-metadata.c
dm zoned: Fix zone reclaim trigger
2020-07-08 12:21:53 -04:00
dm-zoned-reclaim.c
dm zoned: Fix zone reclaim trigger
2020-07-08 12:21:53 -04:00
dm-zoned-target.c
for-5.9/block-20200802
2020-08-03 11:57:03 -07:00
dm-zoned.h
dm zoned: select reclaim zone based on device index
2020-06-05 14:59:53 -04:00
dm.c
Merge branch 'for-5.10/block' into for-5.10/drivers
2020-09-24 13:44:39 -06:00
dm.h
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
Kconfig
Replace HTTP links with HTTPS ones: LVM
2020-07-05 14:28:27 -06:00
Makefile
md: move the early init autodetect code to drivers/md/
2020-07-16 15:34:47 +02:00
md-autodetect.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
md-bitmap.c
md: only calculate blocksize once and use i_blocksize()
2020-09-24 16:44:44 -07:00
md-bitmap.h
…
md-cluster.c
block: add a new revalidate_disk_size helper
2020-09-02 08:00:07 -06:00
md-cluster.h
…
md-faulty.c
block: rename generic_make_request to submit_bio_noacct
2020-07-01 07:27:24 -06:00
md-linear.c
block: add a new revalidate_disk_size helper
2020-09-02 08:00:07 -06:00
md-linear.h
md/raid1: Replace zero-length array with flexible-array
2020-05-13 12:02:23 -07:00
md-multipath.c
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
md-multipath.h
…
md.c
md: add md_submit_discard_bio() for submitting discard bio
2020-09-24 16:44:45 -07:00
md.h
md: add md_submit_discard_bio() for submitting discard bio
2020-09-24 16:44:45 -07:00
raid0.c
md: add md_submit_discard_bio() for submitting discard bio
2020-09-24 16:44:45 -07:00
raid0.h
md/raid0: avoid RAID0 data corruption due to layout confusion.
2019-09-13 13:10:05 -07:00
raid1-10.c
md: raid1-10: Unify r{1,10}bio_pool_free
2019-06-15 01:37:35 -06:00
raid1.c
writeback: remove bdi->congested_fn
2020-07-08 17:20:46 -06:00
raid1.h
md/raid1: Replace zero-length array with flexible-array
2020-05-13 12:02:23 -07:00
raid5-cache.c
raid5-cache: hold spinlock instead of mutex in r5c_journal_mode_show
2020-08-02 23:03:52 -07:00
raid5-log.h
…
raid5-ppl.c
md/raid456: convert macro STRIPE_* to RAID5_STRIPE_*
2020-07-21 17:18:12 -07:00
raid5.c
md/raid5: reallocate page array after setting new stripe_size
2020-09-24 16:44:45 -07:00
raid5.h
md/raid5: let multiple devices of stripe_head share page
2020-09-24 16:44:44 -07:00
raid10.c
md/raid10: improve discard request for far layout
2020-09-24 16:44:45 -07:00
raid10.h
md/raid10: improve discard request for far layout
2020-09-24 16:44:45 -07:00