mac80211: add a fix for racy drv_sta_rc_update calls

Fixes potential crash issues in mt76 and other drivers

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/package/kernel/mac80211/patches/subsys/331-wifi-mac80211-only-call-drv_sta_rc_update-for-upload.patch b/package/kernel/mac80211/patches/subsys/331-wifi-mac80211-only-call-drv_sta_rc_update-for-upload.patch
new file mode 100644 (file)
index 0000000..167b9e3
--- /dev/null
+++ b/package/kernel/mac80211/patches/subsys/331-wifi-mac80211-only-call-drv_sta_rc_update-for-upload.patch
@@ -0,0 +1,25 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Wed, 21 Feb 2024 14:41:40 +0100
+Subject: [PATCH] wifi: mac80211: only call drv_sta_rc_update for uploaded
+ stations
+
+When a station has not been uploaded yet, receiving SMPS or channel width
+notification action frames can lead to rate_control_rate_update calling
+drv_sta_rc_update with uninitialized driver private data.
+Fix this by adding a missing check for sta->uploaded.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/net/mac80211/rate.c
++++ b/net/mac80211/rate.c
+@@ -119,7 +119,8 @@ void rate_control_rate_update(struct iee
+               rcu_read_unlock();
+       }
+ 
+-      drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
++      if (sta->uploaded)
++              drv_sta_rc_update(local, sta->sdata, &sta->sta, changed);
+ }
+ 
+ int ieee80211_rate_control_register(const struct rate_control_ops *ops)