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: dfdfc2beb0dd ("mac80211: Parse legacy and HT rate in injected frames")
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index b3196b1..51e225e 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1691,7 +1691,7 @@
bool rate_found = false;
u8 rate_retries = 0;
u16 rate_flags = 0;
- u8 mcs_known, mcs_flags;
+ u8 mcs_known, mcs_flags, mcs_bw;
u16 vht_known;
u8 vht_mcs = 0, vht_nss = 0;
int i;
@@ -1769,8 +1769,9 @@
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;