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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 <jp.tosoni@acksys.fr>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau 2014-07-22 21:00:26 +02:00 committed by Johannes Berg
parent 8c26d45839
commit fa8f136fe9
1 changed files with 4 additions and 1 deletions
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5
net/mac80211/cfg.c
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@ -472,12 +472,15 @@ static void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
{
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 |