6.6-stable review patch. If anyone has any objections, please let me know.
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From: Miri Korenblit miriam.rachel.korenblit@intel.com
[ Upstream commit 72d520476a2fab6f3489e8388ab524985d6c4b90 ]
A wiphy_work can be queued from the moment the wiphy is allocated and initialized (i.e. wiphy_new_nm). When a wiphy_work is queued, the rdev::wiphy_work is getting queued.
If wiphy_free is called before the rdev::wiphy_work had a chance to run, the wiphy memory will be freed, and then when it eventally gets to run it'll use invalid memory.
Fix this by canceling the work before freeing the wiphy.
Fixes: a3ee4dc84c4e ("wifi: cfg80211: add a work abstraction with special semantics") Signed-off-by: Miri Korenblit miriam.rachel.korenblit@intel.com Reviewed-by: Johannes Berg johannes.berg@intel.com Link: https://patch.msgid.link/20250306123626.efd1d19f6e07.I48229f96f4067ef73f5b87... Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/wireless/core.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/net/wireless/core.c b/net/wireless/core.c index 3c1247933ae92..a2b15349324b6 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -1151,6 +1151,13 @@ void cfg80211_dev_free(struct cfg80211_registered_device *rdev) { struct cfg80211_internal_bss *scan, *tmp; struct cfg80211_beacon_registration *reg, *treg; + unsigned long flags; + + spin_lock_irqsave(&rdev->wiphy_work_lock, flags); + WARN_ON(!list_empty(&rdev->wiphy_work_list)); + spin_unlock_irqrestore(&rdev->wiphy_work_lock, flags); + cancel_work_sync(&rdev->wiphy_work); + rfkill_destroy(rdev->wiphy.rfkill); list_for_each_entry_safe(reg, treg, &rdev->beacon_registrations, list) { list_del(®->list);