From 73a630b359c852d6edc113588c513ddbcd3be47a Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 4 Jan 2023 08:51:19 -0700 Subject: block: handle bio_split_to_limits() NULL return commit 613b14884b8595e20b9fac4126bf627313827fbe upstream. This can't happen right now, but in preparation for allowing bio_split_to_limits() returning NULL if it ended the bio, check for it in all the callers. Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-merge.c | 4 +++- block/blk-mq.c | 5 ++++- drivers/block/drbd/drbd_req.c | 2 ++ drivers/block/ps3vram.c | 2 ++ drivers/md/dm.c | 2 ++ drivers/md/md.c | 2 ++ drivers/nvme/host/multipath.c | 2 ++ drivers/s390/block/dcssblk.c | 2 ++ 8 files changed, 19 insertions(+), 2 deletions(-) diff --git a/block/blk-merge.c b/block/blk-merge.c index f46c87ef951d..84f03d066cb3 100644 --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -358,11 +358,13 @@ struct bio *__bio_split_to_limits(struct bio *bio, struct queue_limits *lim, default: split = bio_split_rw(bio, lim, nr_segs, bs, get_max_io_size(bio, lim) << SECTOR_SHIFT); + if (IS_ERR(split)) + return NULL; break; } if (split) { - /* there isn't chance to merge the splitted bio */ + /* there isn't chance to merge the split bio */ split->bi_opf |= REQ_NOMERGE; blkcg_bio_issue_init(split); diff --git a/block/blk-mq.c b/block/blk-mq.c index 0b855e033a83..63abbe342b28 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2919,8 +2919,11 @@ void blk_mq_submit_bio(struct bio *bio) blk_status_t ret; bio = blk_queue_bounce(bio, q); - if (bio_may_exceed_limits(bio, &q->limits)) + if (bio_may_exceed_limits(bio, &q->limits)) { bio = __bio_split_to_limits(bio, &q->limits, &nr_segs); + if (!bio) + return; + } if (!bio_integrity_prep(bio)) return; diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 7f9bcc82fc9c..d700bf06b534 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -1607,6 +1607,8 @@ void drbd_submit_bio(struct bio *bio) struct drbd_device *device = bio->bi_bdev->bd_disk->private_data; bio = bio_split_to_limits(bio); + if (!bio) + return; /* * what we "blindly" assume: diff --git a/drivers/block/ps3vram.c b/drivers/block/ps3vram.c index c76e0148eada..574e470b220b 100644 --- a/drivers/block/ps3vram.c +++ b/drivers/block/ps3vram.c @@ -587,6 +587,8 @@ static void ps3vram_submit_bio(struct bio *bio) dev_dbg(&dev->core, "%s\n", __func__); bio = bio_split_to_limits(bio); + if (!bio) + return; spin_lock_irq(&priv->lock); busy = !bio_list_empty(&priv->list); diff --git a/drivers/md/dm.c b/drivers/md/dm.c index e30c2d2bc9c7..d49809e9db96 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1755,6 +1755,8 @@ static void dm_split_and_process_bio(struct mapped_device *md, * otherwise associated queue_limits won't be imposed. */ bio = bio_split_to_limits(bio); + if (!bio) + return; } init_clone_info(&ci, md, map, bio, is_abnormal); diff --git a/drivers/md/md.c b/drivers/md/md.c index fd82881761d3..b911085060dc 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -443,6 +443,8 @@ static void md_submit_bio(struct bio *bio) } bio = bio_split_to_limits(bio); + if (!bio) + return; if (mddev->ro == 1 && unlikely(rw == WRITE)) { if (bio_sectors(bio) != 0) diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c index 7e025b8948cb..d09ed0070174 100644 --- a/drivers/nvme/host/multipath.c +++ b/drivers/nvme/host/multipath.c @@ -351,6 +351,8 @@ static void nvme_ns_head_submit_bio(struct bio *bio) * pool from the original queue to allocate the bvecs from. */ bio = bio_split_to_limits(bio); + if (!bio) + return; srcu_idx = srcu_read_lock(&head->srcu); ns = nvme_find_path(head); diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index b392b9f5482e..c0f85ffb2b62 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -865,6 +865,8 @@ dcssblk_submit_bio(struct bio *bio) unsigned long bytes_done; bio = bio_split_to_limits(bio); + if (!bio) + return; bytes_done = 0; dev_info = bio->bi_bdev->bd_disk->private_data; -- cgit v1.2.3