blk-cgroup: fix use-after-free in blkg_conf_open_bdev - #1143
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blkg_conf_open_bdev() holds rq_qos_mutex while checking whether the disk is still live. On the dead-disk error path, it drops the bdev reference before unlocking the mutex. Once that reference is dropped, a concurrent put_disk() can release the remaining device reference and free the bdev. The subsequent mutex_unlock() then dereferences bdev->bd_queue from the freed object. Unlock rq_qos_mutex while the local bdev reference still pins the object. Drop the reference only after the final bdev access. Fixes: a13bd91 ("block/rq_qos: protect rq_qos apis with a new lock") Cc: stable@vger.kernel.org Signed-off-by: Shuangpeng Bai <shuangpeng.kernel@gmail.com>
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Pull request for series with
subject: blk-cgroup: fix use-after-free in blkg_conf_open_bdev
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1146329