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wifi: rtw89: check skb headroom before adding radiotap

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The radiotap headroom is allocated only if IEEE80211_CONF_MONITOR is set.
However, it is potentially racing that SKB allocation without radiotap
headroom but adding radiotap from matched PPDU status of another SKB.
Add a check to avoid the case.

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260506131000.1706298-15-pkshih@realtek.com
This commit is contained in:
Ping-Ke Shih 2026-05-06 21:10:00 +08:00
parent 0805ddc2fd
commit f77199a0cf
1 changed files with 7 additions and 0 deletions
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7
drivers/net/wireless/realtek/rtw89/core.c
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@ -3758,6 +3758,13 @@ static void rtw89_core_update_radiotap(struct rtw89_dev *rtwdev,
if (!(rtwdev->hw->conf.flags & IEEE80211_CONF_MONITOR))
return;
/*
* At transient adding a monitor vif from a station vif, the headroom
* might not include radiotap.
*/
if (unlikely(skb_headroom(skb) < RTW89_RADIOTAP_ROOM + NET_SKB_PAD))
return;
if (rx_status->encoding == RX_ENC_VHT)
rtw89_core_update_radiotap_vht(rtwdev, skb, rx_status, phy_ppdu);
else if (rx_status->encoding == RX_ENC_HE)