summaryrefslogtreecommitdiff
path: root/net
diff options
context:
space:
mode:
authorAshok Nagarajan <ashok@cozybit.com>2012-03-07 00:48:30 +0400
committerJohn W. Linville <linville@tuxdriver.com>2012-03-07 22:51:47 +0400
commit3d4f96997263d97cd4d60373f1ed8184ee6df31b (patch)
treed84bb951aabaa3f4325586aeb51eff0d5c11d2fd /net
parent2ef167557c0a26c88162ecffb017bfcc51eb7b29 (diff)
downloadlinux-3d4f96997263d97cd4d60373f1ed8184ee6df31b.tar.xz
mac80211: Fix potential null pointer dereferencing
The patch "{nl,cfg,mac}80211: Implement RSSI threshold for mesh peering" has a potential null pointer dereferencing problem. Thanks to Dan Carpenter for pointing out. This patch will fix the issue. Signed-off-by: Ashok Nagarajan <ashok@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/mesh_plink.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 80ce52772538..4e53c4cbca9e 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -31,10 +31,11 @@
#define dot11MeshHoldingTimeout(s) (s->u.mesh.mshcfg.dot11MeshHoldingTimeout)
#define dot11MeshMaxPeerLinks(s) (s->u.mesh.mshcfg.dot11MeshMaxPeerLinks)
-#define sta_meets_rssi_threshold(sta, sdata) \
+/* We only need a valid sta if user configured a minimum rssi_threshold. */
+#define rssi_threshold_check(sta, sdata) \
(sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
- (s8) -ewma_read(&sta->avg_signal) > \
- sdata->u.mesh.mshcfg.rssi_threshold)
+ (sta && (s8) -ewma_read(&sta->avg_signal) > \
+ sdata->u.mesh.mshcfg.rssi_threshold))
enum plink_event {
PLINK_UNDEFINED,
@@ -307,7 +308,7 @@ void mesh_neighbour_update(u8 *hw_addr, u32 rates,
sta->plink_state == NL80211_PLINK_LISTEN &&
sdata->u.mesh.accepting_plinks &&
sdata->u.mesh.mshcfg.auto_open_plinks &&
- sta_meets_rssi_threshold(sta, sdata))
+ rssi_threshold_check(sta, sdata))
mesh_plink_open(sta);
rcu_read_unlock();
@@ -538,9 +539,9 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
}
if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
- !sta_meets_rssi_threshold(sta, sdata)) {
+ !rssi_threshold_check(sta, sdata)) {
mpl_dbg("Mesh plink: %pM does not meet rssi threshold\n",
- sta->sta.addr);
+ mgmt->sa);
rcu_read_unlock();
return;
}