Description

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: hold queue_lock when removing blkg->q_node When blkg is removed from q->blkg_list from blkg_free_workfn(), queue_lock has to be held, otherwise, all kinds of bugs(list corruption, hard lockup, ..) can be triggered from blkg_destroy_all().

References 4

• git.kernel.org https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df
• git.kernel.org https://git.kernel.org/stable/c/b5dae1cd0d8368b4338430ff93403df67f0b8bcc
• git.kernel.org https://git.kernel.org/stable/c/c164c7bc9775be7bcc68754bb3431fce5823822e
• git.kernel.org https://git.kernel.org/stable/c/cd4ffdf56791eec95af01f06bee1ec7665ca75c4

Remediation