linux-kernel - [PATCH 4.4 41/75] usbip: fix vhci

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Message-Id: <20210315135209.600299177@linuxfoundation.org>
Date:   Mon, 15 Mar 2021 14:51:55 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: [PATCH 4.4 41/75] usbip: fix vhci_hcd to check for stream socket

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Shuah Khan <skhan@...uxfoundation.org>

commit f55a0571690c4aae03180e001522538c0927432f upstream.

Fix attach_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@...r.kernel.org
Suggested-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Link: https://lore.kernel.org/r/52712aa308915bda02cece1589e04ee8b401d1f3.1615171203.git.skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/usbip/vhci_sysfs.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/usb/usbip/vhci_sysfs.c
+++ b/drivers/usb/usbip/vhci_sysfs.c
@@ -202,8 +202,16 @@ static ssize_t store_attach(struct devic
 
 	/* Extract socket from fd. */
 	socket = sockfd_lookup(sockfd, &err);
-	if (!socket)
+	if (!socket) {
+		dev_err(dev, "failed to lookup sock");
 		return -EINVAL;
+	}
+	if (socket->type != SOCK_STREAM) {
+		dev_err(dev, "Expecting SOCK_STREAM - found %d",
+			socket->type);
+		sockfd_put(socket);
+		return -EINVAL;
+	}
 
 	/* now need lock until setting vdev status as used */