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USB: core: fix check for duplicate endpoints 

Amend the endpoint-descriptor sanity checks to detect all duplicate
endpoint addresses in a configuration.

Commit 0a8fd13462 ("USB: fix problems with duplicate endpoint
addresses") added a check for duplicate endpoint addresses within a
single alternate setting, but did not look for duplicate addresses in
other interfaces.

The current check would also not detect all duplicate addresses when one
endpoint is as a (bi-directional) control endpoint.

This specifically avoids overwriting the endpoint entries in struct
usb_device when enabling a duplicate endpoint, something which could
potentially lead to crashes or leaks, for example, when endpoints are
later disabled.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20191219161016.6695-1-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2019-12-19 17:10:16 +01:00 committed by Greg Kroah-Hartman
parent 46cf053efe
commit 3e4f8e21c4
1 changed files with 58 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/usb/core/config.c
View File

@ -203,9 +203,58 @@ static const unsigned short super_speed_maxpacket_maxes[4] = {
[USB_ENDPOINT_XFER_INT] = 1024,
};
static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
int asnum, struct usb_host_interface *ifp, int num_ep,
unsigned char *buffer, int size)
static bool endpoint_is_duplicate(struct usb_endpoint_descriptor *e1,
struct usb_endpoint_descriptor *e2)
{
if (e1->bEndpointAddress == e2->bEndpointAddress)
return true;
if (usb_endpoint_xfer_control(e1) || usb_endpoint_xfer_control(e2)) {
if (usb_endpoint_num(e1) == usb_endpoint_num(e2))
return true;
}
return false;
}
/*
* Check for duplicate endpoint addresses in other interfaces and in the
* altsetting currently being parsed.
*/
static bool config_endpoint_is_duplicate(struct usb_host_config *config,
int inum, int asnum, struct usb_endpoint_descriptor *d)
{
struct usb_endpoint_descriptor *epd;
struct usb_interface_cache *intfc;
struct usb_host_interface *alt;
int i, j, k;
for (i = 0; i < config->desc.bNumInterfaces; ++i) {
intfc = config->intf_cache[i];
for (j = 0; j < intfc->num_altsetting; ++j) {
alt = &intfc->altsetting[j];
if (alt->desc.bInterfaceNumber == inum &&
alt->desc.bAlternateSetting != asnum)
continue;
for (k = 0; k < alt->desc.bNumEndpoints; ++k) {
epd = &alt->endpoint[k].desc;
if (endpoint_is_duplicate(epd, d))
return true;
}
}
}
return false;
}
static int usb_parse_endpoint(struct device *ddev, int cfgno,
struct usb_host_config *config, int inum, int asnum,
struct usb_host_interface *ifp, int num_ep,
unsigned char *buffer, int size)
{
unsigned char *buffer0 = buffer;
struct usb_endpoint_descriptor *d;
@ -242,13 +291,10 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
goto skip_to_next_endpoint_or_interface_descriptor;
/* Check for duplicate endpoint addresses */
for (i = 0; i < ifp->desc.bNumEndpoints; ++i) {
if (ifp->endpoint[i].desc.bEndpointAddress ==
d->bEndpointAddress) {
dev_warn(ddev, "config %d interface %d altsetting %d has a duplicate endpoint with address 0x%X, skipping\n",
cfgno, inum, asnum, d->bEndpointAddress);
goto skip_to_next_endpoint_or_interface_descriptor;
}
if (config_endpoint_is_duplicate(config, inum, asnum, d)) {
dev_warn(ddev, "config %d interface %d altsetting %d has a duplicate endpoint with address 0x%X, skipping\n",
cfgno, inum, asnum, d->bEndpointAddress);
goto skip_to_next_endpoint_or_interface_descriptor;
}
endpoint = &ifp->endpoint[ifp->desc.bNumEndpoints];
@ -522,8 +568,8 @@ static int usb_parse_interface(struct device *ddev, int cfgno,
if (((struct usb_descriptor_header *) buffer)->bDescriptorType
== USB_DT_INTERFACE)
break;
retval = usb_parse_endpoint(ddev, cfgno, inum, asnum, alt,
num_ep, buffer, size);
retval = usb_parse_endpoint(ddev, cfgno, config, inum, asnum,
alt, num_ep, buffer, size);
if (retval < 0)
return retval;
++n;