diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index 4b4d2b779ec1a08202303863fea1b74c67f04383..a00123ebb0ae0705c8e45e8433a07e96a2a06fe5 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -1735,7 +1735,7 @@ static int ax25_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			res = -EFAULT;
 			break;
 		}
-		if (amount > AX25_NOUID_BLOCK) {
+		if (amount < 0 || amount > AX25_NOUID_BLOCK) {
 			res = -EINVAL;
 			break;
 		}