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From:   Shuah Khan <shuahkh@osg.samsung.com>
To:     valentina.manea.m@gmail.com, shuah@kernel.org,
        gregkh@linuxfoundation.org
Cc:     Shuah Khan <shuahkh@osg.samsung.com>, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH 4.4 4/4] usbip: prevent leaking socket pointer address in messages
Date:   Thu, 25 Jan 2018 11:37:44 -0700
Message-Id: <58c5195a42e57cded63b4dd08fd3d76cda0a040f.1516904424.git.shuahkh@osg.samsung.com>
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Upstream commit 90120d15f4c3 ("usbip: prevent leaking socket pointer
address in messages")

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@osg.samsung.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/usbip/stub_dev.c     |  3 +--
 drivers/usb/usbip/usbip_common.c | 15 ++++-----------
 drivers/usb/usbip/vhci_hcd.c     |  2 +-
 3 files changed, 6 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index a3ec49bdc1e6..ec38370ffcab 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -163,8 +163,7 @@ static void stub_shutdown_connection(struct usbip_device *ud)
 	 * 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);
 	}
 
diff --git a/drivers/usb/usbip/usbip_common.c b/drivers/usb/usbip/usbip_common.c
index 9752b93f754e..1838f1b2c2fa 100644
--- a/drivers/usb/usbip/usbip_common.c
+++ b/drivers/usb/usbip/usbip_common.c
@@ -317,18 +317,14 @@ int usbip_recv(struct socket *sock, void *buf, int size)
 	struct msghdr msg;
 	struct kvec iov;
 	int total = 0;
-
 	/* for blocks of if (usbip_dbg_flag_xmit) */
 	char *bp = buf;
 	int osize = size;
 
-	usbip_dbg_xmit("enter\n");
-
-	if (!sock || !buf || !size) {
-		pr_err("invalid arg, sock %p buff %p size %d\n", sock, buf,
-		       size);
+	if (!sock || !buf || !size)
 		return -EINVAL;
-	}
+
+	usbip_dbg_xmit("enter\n");
 
 	do {
 		sock->sk->sk_allocation = GFP_NOIO;
@@ -341,11 +337,8 @@ int usbip_recv(struct socket *sock, void *buf, int size)
 		msg.msg_flags      = MSG_NOSIGNAL;
 
 		result = kernel_recvmsg(sock, &msg, &iov, 1, size, MSG_WAITALL);
-		if (result <= 0) {
-			pr_debug("receive sock %p buf %p size %u ret %d total %d\n",
-				 sock, buf, size, result, total);
+		if (result <= 0)
 			goto err;
-		}
 
 		size -= result;
 		buf += result;
diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 0aaa8e524afd..00d68945548e 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -778,7 +778,7 @@ static void vhci_shutdown_connection(struct usbip_device *ud)
 
 	/* need this? see stub_dev.c */
 	if (ud->tcp_socket) {
-		pr_debug("shutdown tcp_socket %p\n", ud->tcp_socket);
+		pr_debug("shutdown sockfd %d\n", ud->sockfd);
 		kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 	}
 
-- 
2.14.1