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authorMing Lei <ming.lei@redhat.com>2022-03-14 12:30:18 +0800
committerJens Axboe <axboe@kernel.dk>2022-03-14 14:05:41 -0600
commitdaaca3522a8e67c46e39ef09c1d542e866f85f3b (patch)
treef2e3ea824b72c3fe400e05162b6752e98bdd8012 /block
parent0a5aa8d161d19a1b12fd25b434b32f7c885c73bb (diff)
downloadlinux-daaca3522a8e67c46e39ef09c1d542e866f85f3b.tar.bz2
block: release rq qos structures for queue without disk
blkcg_init_queue() may add rq qos structures to request queue, previously blk_cleanup_queue() calls rq_qos_exit() to release them, but commit 8e141f9eb803 ("block: drain file system I/O on del_gendisk") moves rq_qos_exit() into del_gendisk(), so memory leak is caused because queues may not have disk, such as un-present scsi luns, nvme admin queue, ... Fixes the issue by adding rq_qos_exit() to blk_cleanup_queue() back. BTW, v5.18 won't need this patch any more since we move blkcg_init_queue()/blkcg_exit_queue() into disk allocation/release handler, and patches have been in for-5.18/block. Cc: Christoph Hellwig <hch@lst.de> Cc: stable@vger.kernel.org Fixes: 8e141f9eb803 ("block: drain file system I/O on del_gendisk") Reported-by: syzbot+b42749a851a47a0f581b@syzkaller.appspotmail.com Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220314043018.177141-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 1039515c99d6..779b4a1f66ac 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -50,6 +50,7 @@
#include "blk-mq-sched.h"
#include "blk-pm.h"
#include "blk-throttle.h"
+#include "blk-rq-qos.h"
struct dentry *blk_debugfs_root;
@@ -314,6 +315,9 @@ void blk_cleanup_queue(struct request_queue *q)
*/
blk_freeze_queue(q);
+ /* cleanup rq qos structures for queue without disk */
+ rq_qos_exit(q);
+
blk_queue_flag_set(QUEUE_FLAG_DEAD, q);
blk_sync_queue(q);