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authorRafael Mendonca <rafaelmendsr@gmail.com>2022-08-12 02:23:37 +0300
committerJens Axboe <axboe@kernel.dk>2022-08-12 15:42:06 +0300
commitaa0c680c3aa96a5f9f160d90dd95402ad578e2b0 (patch)
tree0b60271d81e665ea8491dd6e7c9d4f77244ded8d /block
parentcd83cd55878409299f4614c5138d24dffacc39bd (diff)
downloadlinux-aa0c680c3aa96a5f9f160d90dd95402ad578e2b0.tar.xz
block: Do not call blk_put_queue() if gendisk allocation fails
Commit 6f8191fdf41d ("block: simplify disk shutdown") removed the call to blk_get_queue() during gendisk allocation but missed to remove the corresponding cleanup code blk_put_queue() for it. Thus, if the gendisk allocation fails, the request_queue refcount gets decremented and reaches 0, causing blk_mq_release() to be called with a hctx still alive. That triggers a WARNING report, as found by syzkaller: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 23016 at block/blk-mq.c:3881 blk_mq_release+0xf8/0x3e0 block/blk-mq.c:3881 [...] stripped RIP: 0010:blk_mq_release+0xf8/0x3e0 block/blk-mq.c:3881 [...] stripped Call Trace: <TASK> blk_release_queue+0x153/0x270 block/blk-sysfs.c:780 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 __alloc_disk_node+0x4f7/0x610 block/genhd.c:1388 __blk_mq_alloc_disk+0x13b/0x1f0 block/blk-mq.c:3961 loop_add+0x3e2/0xaf0 drivers/block/loop.c:1978 loop_control_ioctl+0x133/0x620 drivers/block/loop.c:2150 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] stripped Fixes: 6f8191fdf41d ("block: simplify disk shutdown") Reported-by: syzbot+31c9594f6e43b9289b25@syzkaller.appspotmail.com Suggested-by: Hillf Danton <hdanton@sina.com> Signed-off-by: Rafael Mendonca <rafaelmendsr@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220811232338.254673-1-rafaelmendsr@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/genhd.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/block/genhd.c b/block/genhd.c
index b901fea1d55a..d36fabf0abc1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1341,7 +1341,7 @@ struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id,
disk = kzalloc_node(sizeof(struct gendisk), GFP_KERNEL, node_id);
if (!disk)
- goto out_put_queue;
+ return NULL;
if (bioset_init(&disk->bio_split, BIO_POOL_SIZE, 0, 0))
goto out_free_disk;
@@ -1390,8 +1390,6 @@ out_free_bioset:
bioset_exit(&disk->bio_split);
out_free_disk:
kfree(disk);
-out_put_queue:
- blk_put_queue(q);
return NULL;
}