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| author | Johannes Berg <johannes.berg@intel.com> | 2021-10-25 13:31:12 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2021-10-25 15:20:22 +0200 |
| commit | 09b1d5dc6ce1c9151777f6c4e128a59457704c97 (patch) | |
| tree | 081ea94c34d6fd411e495d3139fcef8efe3a9b5e /net/wireless/core.h | |
| parent | 95a359c9553342d36d408d35331ff0bfce75272f (diff) | |
| download | lwn-09b1d5dc6ce1c9151777f6c4e128a59457704c97.tar.gz lwn-09b1d5dc6ce1c9151777f6c4e128a59457704c97.zip | |
cfg80211: fix management registrations locking
The management registrations locking was broken, the list was
locked for each wdev, but cfg80211_mgmt_registrations_update()
iterated it without holding all the correct spinlocks, causing
list corruption.
Rather than trying to fix it with fine-grained locking, just
move the lock to the wiphy/rdev (still need the list on each
wdev), we already need to hold the wdev lock to change it, so
there's no contention on the lock in any case. This trivially
fixes the bug since we hold one wdev's lock already, and now
will hold the lock that protects all lists.
Cc: stable@vger.kernel.org
Reported-by: Jouni Malinen <j@w1.fi>
Fixes: 6cd536fe62ef ("cfg80211: change internal management frame registration API")
Link: https://lore.kernel.org/r/20211025133111.5cf733eab0f4.I7b0abb0494ab712f74e2efcd24bb31ac33f7eee9@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/core.h')
| -rw-r--r-- | net/wireless/core.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/wireless/core.h b/net/wireless/core.h index b35d0db12f1d..1720abf36f92 100644 --- a/net/wireless/core.h +++ b/net/wireless/core.h @@ -100,6 +100,8 @@ struct cfg80211_registered_device { struct work_struct propagate_cac_done_wk; struct work_struct mgmt_registrations_update_wk; + /* lock for all wdev lists */ + spinlock_t mgmt_registrations_lock; /* must be last because of the way we do wiphy_priv(), * and it should at least be aligned to NETDEV_ALIGN */ |