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SubjectRe: [PATCH] blk-mq: Fix refcounting leak in __blk_mq_register_dev()
On Sat, Sep 05, 2020 at 03:52:06PM +0300, Dan Carpenter wrote:
> There is a kobject_add() hidden in the call to kobject_add().
>
> ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
> ^^^^^^^^^^^^^^^^^^^^^^^
>
> It needs to be release on the error path.
>
> Fixes: 320ae51feed5 ("blk-mq: new multi-queue block IO queueing mechanism")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> block/blk-mq-sysfs.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
> index 062229395a50..5a63659163c1 100644
> --- a/block/blk-mq-sysfs.c
> +++ b/block/blk-mq-sysfs.c
> @@ -321,7 +321,7 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
>
> ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
> if (ret < 0)
> - goto out;
> + goto out_kobj;
>
> kobject_uevent(q->mq_kobj, KOBJ_ADD);
>
> @@ -333,8 +333,7 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
>
> q->mq_sysfs_init_done = true;
>
> -out:
> - return ret;
> + return 0;
>
> unreg:
> while (--i >= 0)
> @@ -342,6 +341,7 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
>
> kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
> kobject_del(q->mq_kobj);
> +out_kobj:
> kobject_put(&dev->kobj);
> return ret;
> }
> --
> 2.28.0
>

Looks good fix:

Reviewed-by: Ming Lei <ming.lei@redhat.com>

--
Ming

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