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