4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx> [ Upstream commit 1eb507903665442360a959136dfa3234c43db085 ] Do not start to aggregate packets in a A-MSDU frame (converting the first subframe to A-MSDU, adding the header) if max_tx_fragments or max_amsdu_subframes limits are already exceeded by it. In particular, this happens when drivers set the limit to 1 to avoid A-MSDUs at all. Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@xxxxxxxxxx> [reword commit message to be more precise] Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/mac80211/tx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -3208,9 +3208,6 @@ static bool ieee80211_amsdu_aggregate(st if (skb->len + head->len > max_amsdu_len) goto out; - if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) - goto out; - nfrags = 1 + skb_shinfo(skb)->nr_frags; nfrags += 1 + skb_shinfo(head)->nr_frags; frag_tail = &skb_shinfo(head)->frag_list; @@ -3226,6 +3223,9 @@ static bool ieee80211_amsdu_aggregate(st if (max_frags && nfrags > max_frags) goto out; + if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head)) + goto out; + /* * Pad out the previous subframe to a multiple of 4 by adding the * padding to the next one, that's being added. Note that head->len
