Patch "mac80211: fix typo in starting baserate for rts_cts_rate_idx" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

    mac80211: fix typo in starting baserate for rts_cts_rate_idx

to the 3.14-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-fix-typo-in-starting-baserate-for-rts_cts_rate_idx.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From c7abf25af0f41be4b50d44c5b185d52eea360cb8 Mon Sep 17 00:00:00 2001
From: Karl Beldan <karl.beldan@xxxxxxxxxxxxxxxx>
Date: Mon, 13 Oct 2014 14:34:41 +0200
Subject: mac80211: fix typo in starting baserate for rts_cts_rate_idx

From: Karl Beldan <karl.beldan@xxxxxxxxxxxxxxxx>

commit c7abf25af0f41be4b50d44c5b185d52eea360cb8 upstream.

It affects non-(V)HT rates and can lead to selecting an rts_cts rate
that is not a basic rate or way superior to the reference rate (ATM
rates[0] used for the 1st attempt of the protected frame data).

E.g, assuming drivers register growing (bitrate) sorted tables of
ieee80211_rate-s, having :
- rates[0].idx == d'2 and basic_rates == b'10100
will select rts_cts idx b'10011 & ~d'(BIT(2)-1), i.e. 1, likewise
- rates[0].idx == d'2 and basic_rates == b'10001
will select rts_cts idx b'10000
The first is not a basic rate and the second is > rates[0].

Also, wrt severity of the addressed misbehavior, ATM we only have one
rts_cts_rate_idx rather than one per rate table entry, so this idx might
still point to bitrates > rates[1..MAX_RATES].

Fixes: 5253ffb8c9e1 ("mac80211: always pick a basic rate to tx RTS/CTS for pre-HT rates")
Signed-off-by: Karl Beldan <karl.beldan@xxxxxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 net/mac80211/rate.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -462,7 +462,7 @@ static void rate_fixup_ratelist(struct i
 	 */
 	if (!(rates[0].flags & IEEE80211_TX_RC_MCS)) {
 		u32 basic_rates = vif->bss_conf.basic_rates;
-		s8 baserate = basic_rates ? ffs(basic_rates - 1) : 0;
+		s8 baserate = basic_rates ? ffs(basic_rates) - 1 : 0;
 
 		rate = &sband->bitrates[rates[0].idx];
 


Patches currently in stable-queue which might be from karl.beldan@xxxxxxxxxxxxxxxx are

queue-3.14/mac80211-fix-typo-in-starting-baserate-for-rts_cts_rate_idx.patch
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