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| author | Karl Beldan <karl.beldan@rivierawaves.com> | 2014-10-13 16:34:41 +0400 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2014-10-14 13:16:16 +0400 |
| commit | c7abf25af0f41be4b50d44c5b185d52eea360cb8 (patch) | |
| tree | 4f23e16b53e2931a4475afb8f3b8a2c1f434c973 /net | |
| parent | 252e07ca5f64dd31fdfca8027287e7d75fefdab1 (diff) | |
| download | linux-c7abf25af0f41be4b50d44c5b185d52eea360cb8.tar.xz | |
mac80211: fix typo in starting baserate for rts_cts_rate_idx
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")
Cc: stable@vger.kernel.org
Signed-off-by: Karl Beldan <karl.beldan@rivierawaves.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net')
| -rw-r--r-- | net/mac80211/rate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c index 8fdadfd94ba8..6081329784dd 100644 --- a/net/mac80211/rate.c +++ b/net/mac80211/rate.c @@ -448,7 +448,7 @@ static void rate_fixup_ratelist(struct ieee80211_vif *vif, */ 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]; |