lkml.org 
[lkml]   [2019]   [Jul]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5.1 062/138] cfg80211: util: fix bit count off by one
Date
[ Upstream commit 1a473d6092d5d182914bea854ce0b21e6d12519d ]

The bits of Rx MCS Map in VHT capability were enumerated
with index transform - index i -> (i + 1) bit => nss i. BUG!
while it should be - index i -> (i + 1) bit => (i + 1) nss.

The bug was exposed in commit a53b2a0b1245 ("iwlwifi: mvm: implement VHT
extended NSS support in rs.c"), where iwlwifi started using the
function.

Signed-off-by: Mordechay Goodstein <mordechay.goodstein@intel.com>
Fixes: b0aa75f0b1b2 ("ieee80211: add new VHT capability fields/parsing")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/wireless/util.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/wireless/util.c b/net/wireless/util.c
index 5a03f38788e7..5ac66a571e33 100644
--- a/net/wireless/util.c
+++ b/net/wireless/util.c
@@ -1989,7 +1989,7 @@ int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
continue;

if (supp >= mcs_encoding) {
- max_vht_nss = i;
+ max_vht_nss = i + 1;
break;
}
}
--
2.20.1


\
 
 \ /
  Last update: 2019-07-12 14:27    [W:0.512 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site