This is a note to let you know that I've just added the patch titled mac80211: minstrel: fix tx status processing corner case to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mac80211-minstrel-fix-tx-status-processing-corner-case.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From b2911a84396f72149dce310a3b64d8948212c1b3 Mon Sep 17 00:00:00 2001 From: Felix Fietkau <nbd@xxxxxxxx> Date: Wed, 11 Nov 2020 19:33:59 +0100 Subject: mac80211: minstrel: fix tx status processing corner case From: Felix Fietkau <nbd@xxxxxxxx> commit b2911a84396f72149dce310a3b64d8948212c1b3 upstream. Some drivers fill the status rate list without setting the rate index after the final rate to -1. minstrel_ht already deals with this, but minstrel doesn't, which causes it to get stuck at the lowest rate on these drivers. Fix this by checking the count as well. Cc: stable@xxxxxxxxxxxxxxx Fixes: cccf129f820e ("mac80211: add the 'minstrel' rate control algorithm") Signed-off-by: Felix Fietkau <nbd@xxxxxxxx> Link: https://lore.kernel.org/r/20201111183359.43528-3-nbd@xxxxxxxx Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/mac80211/rc80211_minstrel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/mac80211/rc80211_minstrel.c +++ b/net/mac80211/rc80211_minstrel.c @@ -274,7 +274,7 @@ minstrel_tx_status(void *priv, struct ie success = !!(info->flags & IEEE80211_TX_STAT_ACK); for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { - if (ar[i].idx < 0) + if (ar[i].idx < 0 || !ar[i].count) break; ndx = rix_to_ndx(mi, ar[i].idx); Patches currently in stable-queue which might be from nbd@xxxxxxxx are queue-4.9/mac80211-minstrel-fix-tx-status-processing-corner-case.patch queue-4.9/mac80211-minstrel-remove-deferred-sampling-code.patch