1 files changed, 18 insertions, 6 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f07602d..cea3381 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -3461,9 +3461,6 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
 	if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
 		return -EINVAL;
 
-	if (rdev->sched_scan_req)
-		return -EINPROGRESS;
-
 	if (!info->attrs[NL80211_ATTR_SCHED_SCAN_INTERVAL])
 		return -EINVAL;
 
@@ -3502,12 +3499,21 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
 	if (ie_len > wiphy->max_scan_ie_len)
 		return -EINVAL;
 
+	mutex_lock(&rdev->sched_scan_mtx);
+
+	if (rdev->sched_scan_req) {
+		err = -EINPROGRESS;
+		goto out;
+	}
+
 	request = kzalloc(sizeof(*request)
 			+ sizeof(*request->ssids) * n_ssids
 			+ sizeof(*request->channels) * n_channels
 			+ ie_len, GFP_KERNEL);
-	if (!request)
-		return -ENOMEM;
+	if (!request) {
+		err = -ENOMEM;
+		goto out;
+	}
 
 	if (n_ssids)
 		request->ssids = (void *)&request->channels[n_channels];
@@ -3605,6 +3611,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
 out_free:
 	kfree(request);
 out:
+	mutex_unlock(&rdev->sched_scan_mtx);
 	return err;
 }
 
@@ -3612,12 +3619,17 @@ static int nl80211_stop_sched_scan(struct sk_buff *skb,
 				   struct genl_info *info)
 {
 	struct cfg80211_registered_device *rdev = info->user_ptr[0];
+	int err;
 
 	if (!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN) ||
 	    !rdev->ops->sched_scan_stop)
 		return -EOPNOTSUPP;
 
-	return __cfg80211_stop_sched_scan(rdev, false);
+	mutex_lock(&rdev->sched_scan_mtx);
+	err = __cfg80211_stop_sched_scan(rdev, false);
+	mutex_unlock(&rdev->sched_scan_mtx);
+
+	return err;
 }
 
 static int nl80211_send_bss(struct sk_buff *msg, u32 pid, u32 seq, int flags,