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wifi: mac80211: fix race condition on enabling fast-xmit 

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>
Link: https://msgid.link/20240104181059.84032-1-nbd@nbd.name
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2024-01-04 19:10:59 +01:00 committed by Johannes Berg
parent cf4a0d840e
commit bcbc84af11
2 changed files with 3 additions and 1 deletions
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2
net/mac80211/sta_info.c
View File

@ -913,6 +913,8 @@ 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:
if (sta->sta.valid_links)

2
net/mac80211/tx.c
View File

@ -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) ||