mirror-linux/net/wireless
Léo Lam 75c27bdb21 wifi: nl80211: fix deadlock in nl80211_set_cqm_rssi (6.6.x)
Commit 008afb9f3d57 ("wifi: cfg80211: fix CQM for non-range use"
backported to 6.6.x) causes nl80211_set_cqm_rssi not to release the
wdev lock in some of the error paths.

Of course, the ensuing deadlock causes userland network managers to
break pretty badly, and on typical systems this also causes lockups on
on suspend, poweroff and reboot. See [1], [2], [3] for example reports.

The upstream commit 7e7efdda6a ("wifi: cfg80211: fix CQM for non-range
use"), committed in November 2023, is completely fine because there was
another commit in August 2023 that removed the wdev lock:
see commit 076fc8775d ("wifi: cfg80211: remove wdev mutex").

The reason things broke in 6.6.5 is that commit 4338058f6009 was applied
without also applying 076fc8775d.

Commit 076fc8775d ("wifi: cfg80211: remove wdev mutex") is a rather
large commit; adjusting the error handling (which is what this commit does)
yields a much simpler patch and was tested to work properly.

Fix the deadlock by releasing the lock before returning.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=218247
[2] https://bbs.archlinux.org/viewtopic.php?id=290976
[3] https://lore.kernel.org/all/87sf4belmm.fsf@turtle.gmx.de/

Link: https://lore.kernel.org/stable/e374bb16-5b13-44cc-b11a-2f4eefb1ecf5@manjaro.org/
Fixes: 008afb9f3d57 ("wifi: cfg80211: fix CQM for non-range use")
Tested-by: "Léo Lam" <leo@leolam.fr>
Tested-by: "Philip Müller" <philm@manjaro.org>
Cc: stable@vger.kernel.org
Cc: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: "Léo Lam" <leo@leolam.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-01-01 12:39:09 +00:00
..
certs wifi: cfg80211: fix certs build to not depend on file order 2024-01-01 12:39:02 +00:00
.gitignore
Kconfig
Makefile
ap.c
chan.c
core.c wifi: cfg80211: add flush functions for wiphy work 2023-11-20 11:51:51 +01:00
core.h wifi: cfg80211: fix CQM for non-range use 2024-01-01 12:39:09 +00:00
debugfs.c
debugfs.h
ethtool.c
ibss.c
lib80211.c
lib80211_crypt_ccmp.c
lib80211_crypt_tkip.c
lib80211_crypt_wep.c
mesh.c
mlme.c wifi: cfg80211: reject auth/assoc to AP with our address 2023-09-23 11:11:03 +02:00
nl80211.c wifi: nl80211: fix deadlock in nl80211_set_cqm_rssi (6.6.x) 2024-01-01 12:39:09 +00:00
nl80211.h
ocb.c wifi: cfg80211: ocb: don't leave if not joined 2023-09-23 11:11:03 +02:00
of.c
pmsr.c
radiotap.c
rdev-ops.h
reg.c
reg.h
scan.c wifi: cfg80211: Fix 6GHz scan configuration 2023-10-25 12:03:10 +02:00
sme.c wifi: cfg80211: hold wiphy lock in auto-disconnect 2023-10-10 22:00:39 +02:00
sysfs.c wifi: cfg80211: add flush functions for wiphy work 2023-11-20 11:51:51 +01:00
sysfs.h
trace.c
trace.h
util.c wifi: cfg80211: remove links only on AP 2023-09-13 09:42:24 +02:00
wext-compat.c
wext-compat.h
wext-core.c
wext-priv.c
wext-proc.c
wext-sme.c
wext-spy.c