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CVE-2023-53292

blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

CVSS 5.5 MEDIUMEPSS 0.1%CWE-476
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none After grabbing q->sysfs_lock, q->elevator may become NULL because of elevator switch. Fix the NULL dereference on q->elevator by checking it with lock.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
Linux · Linux

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References
https://git.kernel.org/stable/c/245165658e1c9f95c0fecfe02b9b1ebd30a1198ahttps://git.kernel.org/stable/c/3e977386521b71471e66ec2ba82efdfcc456adf2https://git.kernel.org/stable/c/988ddb77218d3975dd13dee7bb0e1fae098a9fdb