Module Name: src
Committed By: riastradh
Date: Fri Apr 21 18:30:32 UTC 2023
Modified Files:
src/sys/dev/dkwedge: dk.c
Log Message:
dk(4): Fix callout detach race.
1. Set a flag sc_iostop under the lock sc_iolock so dkwedge_detach
and dkstart don't race over it.
2. Decline to schedule the callout if sc_iostop is set. The callout
is already only ever scheduled while the lock is held.
3. Use callout_halt to wait for any concurrent callout to complete.
At this point, it can't reschedule itself.
Without this change, the callout could be concurrently rescheduling
itself as we issue callout_stop, leading to use-after-free later.
To generate a diff of this commit:
cvs rdiff -u -r1.141 -r1.142 src/sys/dev/dkwedge/dk.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
