Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 884/917] bcache: fix use-after-free problem in bcache_device_free() | Date | Mon, 15 Nov 2021 18:06:19 +0100 |
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From: Coly Li <colyli@suse.de>
commit 8468f45091d2866affed6f6a7aecc20779139173 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/md/bcache/super.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -885,9 +885,9 @@ static void bcache_device_free(struct bc 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);
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