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| author |   Coly Li <colyli@suse.de> | 2021-11-03 14:49:17 +0800 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-11-03 06:00:29 -0600 |
| commit | 8468f45091d2866affed6f6a7aecc20779139173 (patch) | |
| tree | 8a4faac110eed648c5eba0bc2d0ecabe6360fc50 /drivers/md | |
| parent | zram: replace fsync_bdev with sync_blockdev (diff) | |
| download | linux-dev-8468f45091d2866affed6f6a7aecc20779139173.tar.xz linux-dev-8468f45091d2866affed6f6a7aecc20779139173.zip | |
bcache: fix use-after-free problem in bcache_device_free()
In bcache_device_free(), pointer disk is referenced still in
ida_simple_remove() after blk_cleanup_disk() gets called on this
pointer. This may cause a potential panic by use-after-free on the
disk pointer.
This patch fixes the problem by calling blk_cleanup_disk() after
ida_simple_remove().
Fixes: bc70852fd104 ("bcache: convert to blk_alloc_disk/blk_cleanup_disk")
Signed-off-by: Coly Li <colyli@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: stable@vger.kernel.org # v5.14+
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211103064917.67383-1-colyli@suse.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/bcache/super.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 84a48eed8e24..a7bb3355b776 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -885,9 +885,9 @@ static void bcache_device_free(struct bcache_device *d) bcache_device_detach(d); if (disk) { - blk_cleanup_disk(disk); ida_simple_remove(&bcache_device_idx, first_minor_to_idx(disk->first_minor)); + blk_cleanup_disk(disk); } bioset_exit(&d->bio_split); |