From: Felix Fietkau <nbd@nbd.name>
To: linux-wireless@vger.kernel.org
Cc: johannes@sipsolutions.net
Subject: [PATCH] wifi: mac80211: fix race condition on enabling fast-xmit
Date: Thu, 4 Jan 2024 19:10:59 +0100 [thread overview]
Message-ID: <20240104181059.84032-1-nbd@nbd.name> (raw)
fast-xmit must only be enabled after the sta has been uploaded to the driver,
otherwise it could end up passing the not-yet-uploaded sta via drv_tx calls
to the driver, leading to potential crashes because of uninitialized drv_priv
data.
Add a missing sta->uploaded check and re-check fast xmit after inserting a sta.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
net/mac80211/sta_info.c | 1 +
net/mac80211/tx.c | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index bf1adcd96b41..de34aebc6064 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -909,6 +909,7 @@ static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
if (ieee80211_vif_is_mesh(&sdata->vif))
mesh_accept_plinks_update(sdata);
+ ieee80211_check_fast_xmit(sta);
return 0;
out_remove:
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 314998fdb1a5..68a48abc7287 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3048,7 +3048,7 @@ void ieee80211_check_fast_xmit(struct sta_info *sta)
sdata->vif.type == NL80211_IFTYPE_STATION)
goto out;
- if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
+ if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED) || !sta->uploaded)
goto out;
if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
--
2.43.0
reply other threads:[~2024-01-04 18:11 UTC|newest]
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