From: Shuah Khan <skhan@linuxfoundation.org>
Date: Mon, 8 Mar 2021 03:53:26 +0000 (-0700)
Subject: usbip: fix stub_dev to check for stream socket
X-Git-Tag: v4.4.262~35
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=70d35bf3ce4f3d3d2ed727491c1d22b5f908112b;p=thirdparty%2Fkernel%2Fstable.git

usbip: fix stub_dev to check for stream socket

commit 47ccc8fc2c9c94558b27b6f9e2582df32d29e6e8 upstream.

Fix usbip_sockfd_store() to validate the passed in file descriptor is
a stream socket. If the file descriptor passed was a SOCK_DGRAM socket,
sock_recvmsg() can't detect end of stream.

Cc: stable@vger.kernel.org
Suggested-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/e942d2bd03afb8e8552bd2a5d84e18d17670d521.1615171203.git.skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/usbip/stub_dev.c b/drivers/usb/usbip/stub_dev.c
index 4aad99a59958b..1f2c55588c8df 100644
--- a/drivers/usb/usbip/stub_dev.c
+++ b/drivers/usb/usbip/stub_dev.c
@@ -83,8 +83,16 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
 		}
 
 		socket = sockfd_lookup(sockfd, &err);
-		if (!socket)
+		if (!socket) {
+			dev_err(dev, "failed to lookup sock");
 			goto err;
+		}
+
+		if (socket->type != SOCK_STREAM) {
+			dev_err(dev, "Expecting SOCK_STREAM - found %d",
+				socket->type);
+			goto sock_err;
+		}
 
 		sdev->ud.tcp_socket = socket;
 		sdev->ud.sockfd = sockfd;
@@ -114,6 +122,8 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
 
 	return count;
 
+sock_err:
+	sockfd_put(socket);
 err:
 	spin_unlock_irq(&sdev->ud.lock);
 	return -EINVAL;