linux-kernel - [PATCH 3.2 76/79] usbip: fix stub_send_ret_submit() vulnerability to null transfer

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Message-ID: <lsq.1518322806.310031406@decadent.org.uk>
Date:   Sun, 11 Feb 2018 04:20:06 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Secunia Research" <vuln@...unia.com>,
        "Shuah Khan" <shuahkh@....samsung.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.2 76/79] usbip: fix stub_send_ret_submit() vulnerability
 to null transfer_buffer

3.2.99-rc1 review patch.  If anyone has any objections, please let me know.

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

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

commit be6123df1ea8f01ee2f896a16c2b7be3e4557a5a upstream.

stub_send_ret_submit() handles urb with a potential null transfer_buffer,
when it replays a packet with potential malicious data that could contain
a null buffer. Add a check for the condition when actual_length > 0 and
transfer_buffer is null.

Reported-by: Secunia Research <vuln@...unia.com>
Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.2:
 - Device for logging purposes is &sdev->interface->dev
 - Adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/staging/usbip/stub_tx.c | 7 +++++++
 1 file changed, 7 insertions(+)

--- a/drivers/staging/usbip/stub_tx.c
+++ b/drivers/staging/usbip/stub_tx.c
@@ -178,6 +178,13 @@ static int stub_send_ret_submit(struct s
 		memset(&pdu_header, 0, sizeof(pdu_header));
 		memset(&msg, 0, sizeof(msg));
 
+		if (urb->actual_length > 0 && !urb->transfer_buffer) {
+			dev_err(&sdev->interface->dev,
+				"urb: actual_length %d transfer_buffer null\n",
+				urb->actual_length);
+			return -1;
+		}
+
 		if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
 			iovnum = 2 + urb->number_of_packets;
 		else