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Commit 615ae11b authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: Fix up bogus bInterval values in endpoint descriptors 



This patch (as904) adds code to check for endpoint descriptor bInterval
values outside the legal limits.  Illegal values are set to 32 ms, which
seems like a reasonable default.

This fixes Bugzilla #8432.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent fd209e35

drivers/usb/core/config.c

+41 −1
Original line number Diff line number Diff line 
#include <linux/usb.h>

#include <linux/usb/ch9.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>
@@ -49,7 +50,7 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, 
	unsigned char *buffer0 = buffer;

	struct usb_endpoint_descriptor *d;

	struct usb_host_endpoint *endpoint;

	int n, i;

	int n, i, j;



	d = (struct usb_endpoint_descriptor *) buffer;

	buffer += d->bLength;
@@ -84,6 +85,45 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, 
	memcpy(&endpoint->desc, d, n);

	INIT_LIST_HEAD(&endpoint->urb_list);



	/* If the bInterval value is outside the legal range,

	 * set it to a default value: 32 ms */

	i = 0;		/* i = min, j = max, n = default */

	j = 255;

	if (usb_endpoint_xfer_int(d)) {

		i = 1;

		switch (to_usb_device(ddev)->speed) {

		case USB_SPEED_HIGH:

			n = 9;		/* 32 ms = 2^(9-1) uframes */

			j = 16;

			break;

		default:		/* USB_SPEED_FULL or _LOW */

			/* For low-speed, 10 ms is the official minimum.

			 * But some "overclocked" devices might want faster

			 * polling so we'll allow it. */

			n = 32;

			break;

		}

	} else if (usb_endpoint_xfer_isoc(d)) {

		i = 1;

		j = 16;

		switch (to_usb_device(ddev)->speed) {

		case USB_SPEED_HIGH:

			n = 9;		/* 32 ms = 2^(9-1) uframes */

			break;

		default:		/* USB_SPEED_FULL */

			n = 6;		/* 32 ms = 2^(6-1) frames */

			break;

		}

	}

	if (d->bInterval < i || d->bInterval > j) {

		dev_warn(ddev, "config %d interface %d altsetting %d "

		    "endpoint 0x%X has an invalid bInterval %d, "

		    "changing to %d\n",

		    cfgno, inum, asnum,

		    d->bEndpointAddress, d->bInterval, n);

		endpoint->desc.bInterval = n;

	}



	/* Skip over any Class Specific or Vendor Specific descriptors;

	 * find the next endpoint or interface descriptor */

	endpoint->extra = buffer;