From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B62642363; Mon, 18 Dec 2023 14:10:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UA+KPlaN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD97CC433C7; Mon, 18 Dec 2023 14:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1702908640; bh=7Ypuq7Ij1b06X9PtJ+LH1P4OtlATnO7pJfakxrNg9aI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UA+KPlaNh7zhdNoUTxuDlHw5JkGtkQcWiP3q4+q6Lr6oHCHKuYjYun1eK6s72TzHo YCLnOEANW8Hdm6axAFhf2JEuqS0Yi9PqQ8lTxJZxMBROfdLJTX05F+/ihKLIy2FDzf hIIyIoWbmAX+gsTqO2OJyix001z9m4t7sk43c5TQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Nikolay Kuratov , Stefano Garzarella , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.4 13/40] vsock/virtio: Fix unsigned integer wrap around in virtio_transport_has_space() Date: Mon, 18 Dec 2023 14:52:08 +0100 Message-ID: <20231218135043.196873565@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231218135042.748715259@linuxfoundation.org> References: <20231218135042.748715259@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nikolay Kuratov [ Upstream commit 60316d7f10b17a7ebb1ead0642fee8710e1560e0 ] We need to do signed arithmetic if we expect condition `if (bytes < 0)` to be possible Found by Linux Verification Center (linuxtesting.org) with SVACE Fixes: 06a8fc78367d ("VSOCK: Introduce virtio_vsock_common.ko") Signed-off-by: Nikolay Kuratov Reviewed-by: Stefano Garzarella Link: https://lore.kernel.org/r/20231211162317.4116625-1-kniv@yandex-team.ru Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/vmw_vsock/virtio_transport_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c index 93c11ffae92bb..e0bb83f5746c6 100644 --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -372,7 +372,7 @@ static s64 virtio_transport_has_space(struct vsock_sock *vsk) struct virtio_vsock_sock *vvs = vsk->trans; s64 bytes; - bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); + bytes = (s64)vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); if (bytes < 0) bytes = 0; -- 2.43.0