6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Johannes Berg <johannes.berg@xxxxxxxxx>
[ Upstream commit 583058542f46e3e2b0c536316fbd641f62d91dc6 ]
If we just check "result & RX_DROP_UNUSABLE", this really only works
by accident, because SKB_DROP_REASON_SUBSYS_MAC80211_UNUSABLE got to
have the value 1, and SKB_DROP_REASON_SUBSYS_MAC80211_MONITOR is 2.
Fix this to really check the entire subsys mask for the value, so it
doesn't matter what the subsystem value is.
Fixes: 7f4e09700bdc ("wifi: mac80211: report all unusable beacon frames")
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/mac80211/drop.h | 3 +++
net/mac80211/rx.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/drop.h b/net/mac80211/drop.h
index 49dc809cab290..1570fac8411f4 100644
--- a/net/mac80211/drop.h
+++ b/net/mac80211/drop.h
@@ -53,4 +53,7 @@ enum mac80211_drop_reason {
#undef DEF
};
+#define RX_RES_IS_UNUSABLE(result) \
+ (((__force u32)(result) & SKB_DROP_REASON_SUBSYS_MASK) == ___RX_DROP_UNUSABLE)
+
#endif /* MAC80211_DROP_H */
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 8f6b6f56b65b4..26ca2f5dc52b2 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2112,7 +2112,7 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
/* either the frame has been decrypted or will be dropped */
status->flag |= RX_FLAG_DECRYPTED;
- if (unlikely(ieee80211_is_beacon(fc) && (result & RX_DROP_UNUSABLE) &&
+ if (unlikely(ieee80211_is_beacon(fc) && RX_RES_IS_UNUSABLE(result) &&
rx->sdata->dev))
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev,
skb->data, skb->len);
--
2.42.0
