diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 24bee07ee4ce..4be6a264b475 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -2852,6 +2852,9 @@ static struct sk_buff *l2cap_build_cmd(struct l2cap_conn *conn, u8 code,
 	BT_DBG("conn %p, code 0x%2.2x, ident 0x%2.2x, len %u",
 	       conn, code, ident, dlen);
 
+	if (conn->mtu < L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE)
+		return NULL;
+
 	len = L2CAP_HDR_SIZE + L2CAP_CMD_HDR_SIZE + dlen;
 	count = min_t(unsigned int, conn->mtu, len);