From a463b5c2da927c8904ad2144885e99f901fcf59f Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Tue, 22 Jul 2014 19:06:14 +0000 Subject: [PATCH] mac80211: fix a null pointer deref when querying station info when rate control is not initialized (#17061) Signed-off-by: Felix Fietkau Backport of r41801 SVN-Revision: 41803 --- .../mac80211/patches/300-pending_work.patch | 22 +++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/package/mac80211/patches/300-pending_work.patch b/package/mac80211/patches/300-pending_work.patch index d6687b762d..ba05bde005 100644 --- a/package/mac80211/patches/300-pending_work.patch +++ b/package/mac80211/patches/300-pending_work.patch @@ -1,3 +1,18 @@ +commit 38695a6e5a940e6a524523b88a33916b016fb2a1 +Author: Felix Fietkau +Date: Fri Jul 11 12:06:18 2014 +0200 + + mac80211: fix crash on getting sta info with uninitialized rate control + + If the expected throughput is queried before rate control has been + initialized, the minstrel op for it will crash while trying to access + the rate table. + Check for WLAN_STA_RATE_CONTROL before attempting to use the rate + control op. + + Reported-by: Jean-Pierre Tosoni + Signed-off-by: Felix Fietkau + commit c0ee7fa4c0da824ccccc172bf175fb1f86540921 Author: Felix Fietkau Date: Wed Jul 16 18:00:31 2014 +0200 @@ -660,7 +675,7 @@ Date: Mon May 19 21:20:49 2014 +0200 } EXPORT_SYMBOL(ieee80211_sta_block_awake); -@@ -1703,3 +1723,137 @@ u8 sta_info_tx_streams(struct sta_info * +@@ -1703,3 +1723,140 @@ u8 sta_info_tx_streams(struct sta_info * return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; } @@ -669,12 +684,15 @@ Date: Mon May 19 21:20:49 2014 +0200 +{ + struct ieee80211_sub_if_data *sdata = sta->sdata; + struct ieee80211_local *local = sdata->local; -+ struct rate_control_ref *ref = local->rate_ctrl; ++ struct rate_control_ref *ref = NULL; + struct timespec uptime; + u64 packets = 0; + u32 thr = 0; + int i, ac; + ++ if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL)) ++ ref = local->rate_ctrl; ++ + sinfo->generation = sdata->local->sta_generation; + + sinfo->filled = STATION_INFO_INACTIVE_TIME | -- 2.30.2