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authorMing Lei <ming.lei@redhat.com>2021-09-24 14:07:04 +0300
committerJens Axboe <axboe@kernel.dk>2021-09-24 20:04:39 +0300
commita647a524a46736786c95cdb553a070322ca096e3 (patch)
tree9e521c7d5b50c6a8f708865d889ce7afc8d16aec
parent5cad87569164fbdd5279504d7bc089aea51bf0f4 (diff)
downloadlinux-a647a524a46736786c95cdb553a070322ca096e3.tar.xz
block: don't call rq_qos_ops->done_bio if the bio isn't tracked
rq_qos framework is only applied on request based driver, so: 1) rq_qos_done_bio() needn't to be called for bio based driver 2) rq_qos_done_bio() needn't to be called for bio which isn't tracked, such as bios ended from error handling code. Especially in bio_endio(): 1) request queue is referred via bio->bi_bdev->bd_disk->queue, which may be gone since request queue refcount may not be held in above two cases 2) q->rq_qos may be freed in blk_cleanup_queue() when calling into __rq_qos_done_bio() Fix the potential kernel panic by not calling rq_qos_ops->done_bio if the bio isn't tracked. This way is safe because both ioc_rqos_done_bio() and blkcg_iolatency_done_bio() are nop if the bio isn't tracked. Reported-by: Yu Kuai <yukuai3@huawei.com> Cc: tj@kernel.org Signed-off-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20210924110704.1541818-1-ming.lei@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/bio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c
index 5df3dd282e40..a6fb6a0b4295 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -1466,7 +1466,7 @@ again:
if (!bio_integrity_endio(bio))
return;
- if (bio->bi_bdev)
+ if (bio->bi_bdev && bio_flagged(bio, BIO_TRACKED))
rq_qos_done_bio(bio->bi_bdev->bd_disk->queue, bio);
if (bio->bi_bdev && bio_flagged(bio, BIO_TRACE_COMPLETION)) {