[PATCH 5.14 217/334] mac80211: Fix insufficient headroom issue for AMSDU

Greg Kroah-Hartman
2021-09-13T14:40:55Z

From: Chih-Kang Chang <gary.chang@realtek.com>

[ Upstream commit f50d2ff8f016b79a2ff4acd5943a1eda40c545d4 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mac80211/tx.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 8509778ff31f..fa09a369214d 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));
--
2.30.2