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authorFelix Fietkau <nbd@openwrt.org>2011-03-25 14:30:38 (GMT)
committerJohn W. Linville <linville@tuxdriver.com>2011-03-28 19:42:01 (GMT)
commit4dc217df68a17a57f8464c74c1b4785e40bddf77 (patch)
tree12a239bc636c6499f929ed352e496559bbc241f1 /net/mac80211
parentb77dcf8460ae57d4eb9fd3633eb4f97b8fb20716 (diff)
downloadlinux-4dc217df68a17a57f8464c74c1b4785e40bddf77.tar.xz
mac80211: fix a crash in minstrel_ht in HT mode with no supported MCS rates
When a client connects in HT mode but does not provide any valid MCS rates, the function that finds the next sample rate gets stuck in an infinite loop. Fix this by falling back to legacy rates if no usable MCS rates are found. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Cc: stable@kernel.org Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211')
-rw-r--r--net/mac80211/rc80211_minstrel_ht.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 8212a8b..dbdebeda 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -659,18 +659,14 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
struct ieee80211_mcs_info *mcs = &sta->ht_cap.mcs;
struct ieee80211_local *local = hw_to_local(mp->hw);
u16 sta_cap = sta->ht_cap.cap;
+ int n_supported = 0;
int ack_dur;
int stbc;
int i;
/* fall back to the old minstrel for legacy stations */
- if (!sta->ht_cap.ht_supported) {
- msp->is_ht = false;
- memset(&msp->legacy, 0, sizeof(msp->legacy));
- msp->legacy.r = msp->ratelist;
- msp->legacy.sample_table = msp->sample_table;
- return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy);
- }
+ if (!sta->ht_cap.ht_supported)
+ goto use_legacy;
BUILD_BUG_ON(ARRAY_SIZE(minstrel_mcs_groups) !=
MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS);
@@ -725,7 +721,22 @@ minstrel_ht_update_caps(void *priv, struct ieee80211_supported_band *sband,
mi->groups[i].supported =
mcs->rx_mask[minstrel_mcs_groups[i].streams - 1];
+
+ if (mi->groups[i].supported)
+ n_supported++;
}
+
+ if (!n_supported)
+ goto use_legacy;
+
+ return;
+
+use_legacy:
+ msp->is_ht = false;
+ memset(&msp->legacy, 0, sizeof(msp->legacy));
+ msp->legacy.r = msp->ratelist;
+ msp->legacy.sample_table = msp->sample_table;
+ return mac80211_minstrel.rate_init(priv, sband, sta, &msp->legacy);
}
static void