cfg80211: minimal error handling for wext-compat freq scanning

Signed-off-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 6c20b6515ab0..e5f92ee758f4 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -675,6 +675,11 @@ int cfg80211_wext_siwscan(struct net_device *dev,
                 wext_freq_not_found: ;
                 }
         }
+        /* No channels found? */
+        if (!i) {
+                err = -EINVAL;
+                goto out;
+        }
 
         /* Set real number of channels specified in creq->channels[] */
         creq->n_channels = i;