From: Chih-Kang Chang <gary.chang@realtek.com>
Date: Mon, 16 Aug 2021 08:51:28 +0000 (+0800)
Subject: mac80211: Fix insufficient headroom issue for AMSDU
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=f50d2ff8f016b79a2ff4acd5943a1eda40c545d4;p=linux.git

mac80211: Fix insufficient headroom issue for AMSDU

ieee80211_amsdu_realloc_pad() fails to account for extra_tx_headroom,
the original reserved headroom might be eaten. Add the necessary
extra_tx_headroom.

Fixes: 6e0456b54545 ("mac80211: add A-MSDU tx support")
Signed-off-by: Chih-Kang Chang <gary.chang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://lore.kernel.org/r/20210816085128.10931-2-pkshih@realtek.com
[fix indentation]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 1f7571777fb1e..2d1193ed3eb52 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3242,7 +3242,9 @@ static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
 	if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
 		return true;
 
-	if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(*amsdu_hdr)))
+	if (!ieee80211_amsdu_realloc_pad(local, skb,
+					 sizeof(*amsdu_hdr) +
+					 local->hw.extra_tx_headroom))
 		return false;
 
 	data = skb_push(skb, sizeof(*amsdu_hdr));