linux-kernel - [PATCH 4.14 119/146] usbip: prevent leaking socket pointer address in messages

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Date:   Mon,  1 Jan 2018 15:38:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shuah Khan <shuahkh@....samsung.com>
Subject: [PATCH 4.14 119/146] usbip: prevent leaking socket pointer address in messages

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Shuah Khan <shuahkh@....samsung.com>

commit 90120d15f4c397272aaf41077960a157fc4212bf upstream.

usbip driver is leaking socket pointer address in messages. Remove
the messages that aren't useful and print sockfd in the ones that
are useful for debugging.

Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/usbip/stub_dev.c     |    3 +--
 drivers/usb/usbip/usbip_common.c |   16 +++++-----------
 drivers/usb/usbip/vhci_hcd.c     |    2 +-
 3 files changed, 7 insertions(+), 14 deletions(-)

--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -163,8 +163,7 @@ static void stub_shutdown_connection(str
 	 * step 1?
 	 */
 	if (ud->tcp_socket) {
-		dev_dbg(&sdev->udev->dev, "shutdown tcp_socket %p\n",
-			ud->tcp_socket);
+		dev_dbg(&sdev->udev->dev, "shutdown sockfd %d\n", ud->sockfd);
 		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 	}
 
--- a/drivers/usb/usbip/usbip_common.c
+++ b/drivers/usb/usbip/usbip_common.c
@@ -331,26 +331,20 @@ int usbip_recv(struct socket *sock, void
 	struct msghdr msg = {.msg_flags = MSG_NOSIGNAL};
 	int total = 0;
 
+	if (!sock || !buf || !size)
+		return -EINVAL;
+
 	iov_iter_kvec(&msg.msg_iter, READ|ITER_KVEC, &iov, 1, size);
 
 	usbip_dbg_xmit("enter\n");
 
-	if (!sock || !buf || !size) {
-		pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
-		       size);
-		return -EINVAL;
-	}
-
 	do {
-		int sz = msg_data_left(&msg);
+		msg_data_left(&msg);
 		sock->sk->sk_allocation = GFP_NOIO;
 
 		result = sock_recvmsg(sock, &msg, MSG_WAITALL);
-		if (result <= 0) {
-			pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
-				 sock, buf + total, sz, result, total);
+		if (result <= 0)
 			goto err;
-		}
 
 		total += result;
 	} while (msg_data_left(&msg));
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -989,7 +989,7 @@ static void vhci_shutdown_connection(str
 
 	/* need this? see stub_dev.c */
 	if (ud->tcp_socket) {
-		pr_debug("shutdown tcp_socket %p\n", ud->tcp_socket);
+		pr_debug("shutdown tcp_socket %d\n", ud->sockfd);
 		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 	}