diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 4b4d2b7..a00123e 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1735,7 +1735,7 @@
 			res = -EFAULT;
 			break;
 		}
-		if (amount > AX25_NOUID_BLOCK) {
+		if (amount < 0 || amount > AX25_NOUID_BLOCK) {
 			res = -EINVAL;
 			break;
 		}