diff --git a/net/wireless/wext-core.c b/net/wireless/wext-core.c
index a125fd1fa134..a161c64d1765 100644
--- a/net/wireless/wext-core.c
+++ b/net/wireless/wext-core.c
@@ -815,6 +815,12 @@ static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 		}
 	}
 
+	/* Sanity-check to ensure we never end up _allocating_ zero
+	 * bytes of data for extra.
+	 */
+	if (extra_size <= 0)
+		return -EFAULT;
+
 	/* kzalloc() ensures NULL-termination for essid_compat. */
 	extra = kzalloc(extra_size, GFP_KERNEL);
 	if (!extra)