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Commit 65486c8b authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

cfg80211: fix error path in cfg80211_wext_siwscan 



If there's an invalid channel or SSID, the code leaks
the scan request. Always free the scan request, unless
it was successfully given to the driver.

Reported-by: default avatarDan Carpenter <error27@gmail.com>
Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Acked-by: default avatarDan Carpenter <error27@gmail.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent befabac2

net/wireless/scan.c

+9 −4
Original line number Diff line number Diff line
@@ -601,7 +601,7 @@ int cfg80211_wext_siwscan(struct net_device *dev, 
	struct cfg80211_registered_device *rdev;

	struct wiphy *wiphy;

	struct iw_scan_req *wreq = NULL;

	struct cfg80211_scan_request *creq;

	struct cfg80211_scan_request *creq = NULL;

	int i, err, n_channels = 0;

	enum ieee80211_band band;
@@ -694,8 +694,10 @@ int cfg80211_wext_siwscan(struct net_device *dev, 
	/* translate "Scan for SSID" request */

	if (wreq) {

		if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {

			if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)

				return -EINVAL;

			if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {

				err = -EINVAL;

				goto out;

			}

			memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);

			creq->ssids[0].ssid_len = wreq->essid_len;

		}
@@ -707,12 +709,15 @@ int cfg80211_wext_siwscan(struct net_device *dev, 
	err = rdev->ops->scan(wiphy, dev, creq);

	if (err) {

		rdev->scan_req = NULL;

		kfree(creq);

		/* creq will be freed below */

	} else {

		nl80211_send_scan_start(rdev, dev);

		/* creq now owned by driver */

		creq = NULL;

		dev_hold(dev);

	}

 out:

	kfree(creq);

	cfg80211_unlock_rdev(rdev);

	return err;

}