From 31e0456de5be379b10fea0fa94a681057114a96e Mon Sep 17 00:00:00 2001
From: Alan Stern <stern@rowland.harvard.edu>
Date: Tue, 7 May 2019 12:39:47 -0400
Subject: [PATCH] media: usb: siano: Fix general protection fault in smsusb
Git-commit: 31e0456de5be379b10fea0fa94a681057114a96e
Patch-mainline: v5.2-rc3
References: bsc#1051510 bsc#1146413 CVE-2019-15218

The syzkaller USB fuzzer found a general-protection-fault bug in the
smsusb part of the Siano DVB driver.  The fault occurs during probe
because the driver assumes without checking that the device has both
IN and OUT endpoints and the IN endpoint is ep1.

By slightly rearranging the driver's initialization code, we can make
the appropriate checks early on and thus avoid the problem.  If the
expected endpoints aren't present, the new code safely returns -ENODEV
from the probe routine.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-and-tested-by: syzbot+53f029db71c19a47325a@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/media/usb/siano/smsusb.c |   33 ++++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

--- a/drivers/media/usb/siano/smsusb.c
+++ b/drivers/media/usb/siano/smsusb.c
@@ -402,6 +402,7 @@ static int smsusb_init_device(struct usb
 	struct smsusb_device_t *dev;
 	void *mdev;
 	int i, rc;
+	int in_maxp;
 
 	/* create device object */
 	dev = kzalloc(sizeof(struct smsusb_device_t), GFP_KERNEL);
@@ -413,6 +414,24 @@ static int smsusb_init_device(struct usb
 	dev->udev = interface_to_usbdev(intf);
 	dev->state = SMSUSB_DISCONNECTED;
 
+	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
+		struct usb_endpoint_descriptor *desc =
+				&intf->cur_altsetting->endpoint[i].desc;
+
+		if (desc->bEndpointAddress & USB_DIR_IN) {
+			dev->in_ep = desc->bEndpointAddress;
+			in_maxp = usb_endpoint_maxp(desc);
+		} else {
+			dev->out_ep = desc->bEndpointAddress;
+		}
+	}
+
+	pr_debug("in_ep = %02x, out_ep = %02x\n", dev->in_ep, dev->out_ep);
+	if (!dev->in_ep || !dev->out_ep) {	/* Missing endpoints? */
+		smsusb_term_device(intf);
+		return -ENODEV;
+	}
+
 	params.device_type = sms_get_board(board_id)->type;
 
 	switch (params.device_type) {
@@ -427,24 +446,12 @@ static int smsusb_init_device(struct usb
 		/* fall-thru */
 	default:
 		dev->buffer_size = USB2_BUFFER_SIZE;
-		dev->response_alignment =
-		    le16_to_cpu(dev->udev->ep_in[1]->desc.wMaxPacketSize) -
-		    sizeof(struct sms_msg_hdr);
+		dev->response_alignment = in_maxp - sizeof(struct sms_msg_hdr);
 
 		params.flags |= SMS_DEVICE_FAMILY2;
 		break;
 	}
 
-	for (i = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) {
-		if (intf->cur_altsetting->endpoint[i].desc. bEndpointAddress & USB_DIR_IN)
-			dev->in_ep = intf->cur_altsetting->endpoint[i].desc.bEndpointAddress;
-		else
-			dev->out_ep = intf->cur_altsetting->endpoint[i].desc.bEndpointAddress;
-	}
-
-	pr_debug("in_ep = %02x, out_ep = %02x\n",
-		dev->in_ep, dev->out_ep);
-
 	params.device = &dev->udev->dev;
 	params.buffer_size = dev->buffer_size;
 	params.num_buffers = MAX_BUFFERS;