| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 59/66] bcache: Fix leak of bdev reference | Date | Sun, 24 Sep 2017 22:31:54 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Jan Kara <jack@suse.cz>
commit 4b758df21ee7081ab41448d21d60367efaa625b3 upstream.
If blkdev_get_by_path() in register_bcache() fails, we try to lookup the block device using lookup_bdev() to detect which situation we are in to properly report error. However we never drop the reference returned to us from lookup_bdev(). Fix that.
Signed-off-by: Jan Kara <jack@suse.cz> Acked-by: Coly Li <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, 2 insertions(+)
--- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -1960,6 +1960,8 @@ static ssize_t register_bcache(struct ko else err = "device busy"; mutex_unlock(&bch_register_lock); + if (!IS_ERR(bdev)) + bdput(bdev); if (attr == &ksysfs_register_quiet) goto out; }
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