2020-11-11 18:36:06

by Felix Fietkau

[permalink] [raw]
Subject: [PATCH 5.10 1/3] mac80211: fix memory leak on filtered powersave frames

After the status rework, ieee80211_tx_status_ext is leaking un-acknowledged
packets for stations in powersave mode.
To fix this, move the code handling those packets from __ieee80211_tx_status
into ieee80211_tx_status_ext

Reported-by: Tobias Waldvogel <[email protected]>
Fixes: 3318111cf63d ("mac80211: reduce duplication in tx status functions")
Signed-off-by: Felix Fietkau <[email protected]>
---
net/mac80211/status.c | 18 ++++++++----------
1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index 6feb45135020..3485610755ef 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -49,7 +49,8 @@ static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
int ac;

if (info->flags & (IEEE80211_TX_CTL_NO_PS_BUFFER |
- IEEE80211_TX_CTL_AMPDU)) {
+ IEEE80211_TX_CTL_AMPDU |
+ IEEE80211_TX_CTL_HW_80211_ENCAP)) {
ieee80211_free_txskb(&local->hw, skb);
return;
}
@@ -915,15 +916,6 @@ static void __ieee80211_tx_status(struct ieee80211_hw *hw,
ieee80211_mpsp_trigger_process(
ieee80211_get_qos_ctl(hdr), sta, true, acked);

- if (!acked && test_sta_flag(sta, WLAN_STA_PS_STA)) {
- /*
- * The STA is in power save mode, so assume
- * that this TX packet failed because of that.
- */
- ieee80211_handle_filtered_frame(local, sta, skb);
- return;
- }
-
if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL) &&
(ieee80211_is_data(hdr->frame_control)) &&
(rates_idx != -1))
@@ -1150,6 +1142,12 @@ void ieee80211_tx_status_ext(struct ieee80211_hw *hw,
-info->status.ack_signal);
}
} else if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
+ /*
+ * The STA is in power save mode, so assume
+ * that this TX packet failed because of that.
+ */
+ if (skb)
+ ieee80211_handle_filtered_frame(local, sta, skb);
return;
} else if (noack_success) {
/* nothing to do here, do not account as lost */
--
2.28.0