From: Lior Cohen <lior2.cohen@xxxxxxxxx>
Suspicious RCU usage observed while calling the
cfg80211_sta_opmode_change_notify() during rx_handlers path.
The issue occurred due to illegal blocking while in RCU read-side
critical section. The blocking caused by an attempt to alloc skb with the
GFP_KERNEL flag, which eventually call the might_sleep().
Signed-off-by: Lior Cohen <lior2.cohen@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
---
net/mac80211/rx.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 3bd3b5769797..a69ecfb212ed 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3063,7 +3063,7 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
cfg80211_sta_opmode_change_notify(sdata->dev,
rx->sta->addr,
&sta_opmode,
- GFP_KERNEL);
+ GFP_ATOMIC);
goto handled;
}
case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: {
@@ -3100,7 +3100,7 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
cfg80211_sta_opmode_change_notify(sdata->dev,
rx->sta->addr,
&sta_opmode,
- GFP_KERNEL);
+ GFP_ATOMIC);
goto handled;
}
default:
--
2.19.2
