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From: Sven Eckelmann <sven@narfation.org>
Date: Wed, 24 Feb 2016 16:25:49 +0100
Subject: [PATCH] mac80211: fix parsing of 40Mhz in injected radiotap
header
The MCS bandwidth part of the radiotap header is 2 bits wide. The full 2
bit have to compared against IEEE80211_RADIOTAP_MCS_BW_40 and not only if
the first bit is set. Otherwise IEEE80211_RADIOTAP_MCS_BW_40 can be
confused with IEEE80211_RADIOTAP_MCS_BW_20U.
Fixes: 5ec3aed9ba4c ("mac80211: Parse legacy and HT rate in injected frames")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1689,7 +1689,7 @@ static bool ieee80211_parse_tx_radiotap(
bool rate_found = false;
u8 rate_retries = 0;
u16 rate_flags = 0;
- u8 mcs_known, mcs_flags;
+ u8 mcs_known, mcs_flags, mcs_bw;
int i;
info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
@@ -1765,8 +1765,9 @@ static bool ieee80211_parse_tx_radiotap(
mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
rate_flags |= IEEE80211_TX_RC_SHORT_GI;
+ mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
- mcs_flags & IEEE80211_RADIOTAP_MCS_BW_40)
+ mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
break;
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