CVE-2021-47382 Information

Description

In the Linux kernel the following vulnerability has been resolved:

s390/qeth: fix deadlock during failing recovery

Commit 0b9902c1fcc5 (\s390/qeth: fix deadlock during recovery) removed taking discipline_mutex inside qeth_do_reset() fixing potential deadlocks. An error path was missed though that still takes discipline_mutex and thus has the original deadlock potential.

Intermittent deadlocks were seen when a qeth channel path is configured offline causing a race between qeth_do_reset and ccwgroup_remove. Call qeth_set_offline() directly in the qeth_do_reset() error case and then a new variant of ccwgroup_set_offline() without taking discipline_mutex.

Reference

https://git.kernel.org/stable/c/0bfe741741327822d1482c7edef0184636d08b40 https://git.kernel.org/stable/c/d2b59bd4b06d84a4eadb520b0f71c62fe8ec0a62