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paride/pcd: need to set queue to NULL before put_disk 

In pcd_init_units, if blk_mq_init_sq_queue fails, need to set queue to
NULL before put_disk, otherwise null-ptr-deref Read will occur.

put_disk
  kobject_put
    disk_release
      blk_put_queue(disk->queue)

Fixes: f0d1762554 ("paride/pcd: Fix potential NULL pointer dereference and mem leak")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
zhengbin 2019-08-13 19:27:40 +08:00 committed by Jens Axboe
parent ecf4d59a4e
commit d821cce8ac
1 changed files with 1 additions and 1 deletions
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2
drivers/block/paride/pcd.c
View File

@ -314,8 +314,8 @@ static void pcd_init_units(void)
disk->queue = blk_mq_init_sq_queue(&cd->tag_set, &pcd_mq_ops,
1, BLK_MQ_F_SHOULD_MERGE);
if (IS_ERR(disk->queue)) {
put_disk(disk);
disk->queue = NULL;
put_disk(disk);
continue;
}