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usb: gadget: composite: fix incorrect handling of OS desc requests 

When handling an OS descriptor request, one of the first operations is
to zero out the request buffer using the wLength from the setup packet.
There is no bounds checking, so a wLength > 4096 would clobber memory
adjacent to the request buffer. Fix this by taking the min of wLength
and the request buffer length prior to the memset. While at it, define
the buffer length in a header file so that magic numbers don't appear
throughout the code.

When returning data to the host, the data length should be the min of
the wLength and the valid data we have to return. Currently we are
returning wLength, thus requests for a wLength greater than the amount
of data in the OS descriptor buffer would return invalid (albeit zero'd)
data following the valid descriptor data. Fix this by counting the
number of bytes when constructing the data and using this when
determining the length of the request.

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Chris Dickens 2017-12-31 18:59:42 -08:00 committed by Felipe Balbi
parent f376899701
commit 5d6ae4f0da
2 changed files with 22 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/usb/gadget/composite.c
View File

@ -1422,7 +1422,7 @@ static int count_ext_compat(struct usb_configuration *c)
return res;
}
static void fill_ext_compat(struct usb_configuration *c, u8 *buf)
static int fill_ext_compat(struct usb_configuration *c, u8 *buf)
{
int i, count;
@ -1449,10 +1449,12 @@ static void fill_ext_compat(struct usb_configuration *c, u8 *buf)
buf += 23;
}
count += 24;
if (count >= 4096)
return;
if (count + 24 >= USB_COMP_EP0_OS_DESC_BUFSIZ)
return count;
}
}
return count;
}
static int count_ext_prop(struct usb_configuration *c, int interface)
@ -1497,25 +1499,20 @@ static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
struct usb_os_desc *d;
struct usb_os_desc_ext_prop *ext_prop;
int j, count, n, ret;
u8 *start = buf;
f = c->interface[interface];
count = 10; /* header length */
for (j = 0; j < f->os_desc_n; ++j) {
if (interface != f->os_desc_table[j].if_id)
continue;
d = f->os_desc_table[j].os_desc;
if (d)
list_for_each_entry(ext_prop, &d->ext_prop, entry) {
/* 4kB minus header length */
n = buf - start;
if (n >= 4086)
return 0;
count = ext_prop->data_len +
n = ext_prop->data_len +
ext_prop->name_len + 14;
if (count > 4086 - n)
return -EINVAL;
usb_ext_prop_put_size(buf, count);
if (count + n >= USB_COMP_EP0_OS_DESC_BUFSIZ)
return count;
usb_ext_prop_put_size(buf, n);
usb_ext_prop_put_type(buf, ext_prop->type);
ret = usb_ext_prop_put_name(buf, ext_prop->name,
ext_prop->name_len);
@ -1541,11 +1538,12 @@ static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf)
default:
return -EINVAL;
}
buf += count;
buf += n;
count += n;
}
}
return 0;
return count;
}
/*
@ -1827,6 +1825,7 @@ unknown:
req->complete = composite_setup_complete;
buf = req->buf;
os_desc_cfg = cdev->os_desc_config;
w_length = min_t(u16, w_length, USB_COMP_EP0_OS_DESC_BUFSIZ);
memset(buf, 0, w_length);
buf[5] = 0x01;
switch (ctrl->bRequestType & USB_RECIP_MASK) {
@ -1850,8 +1849,8 @@ unknown:
count += 16; /* header */
put_unaligned_le32(count, buf);
buf += 16;
fill_ext_compat(os_desc_cfg, buf);
value = w_length;
value = fill_ext_compat(os_desc_cfg, buf);
value = min_t(u16, w_length, value);
}
break;
case USB_RECIP_INTERFACE:
@ -1880,8 +1879,7 @@ unknown:
interface, buf);
if (value < 0)
return value;
value = w_length;
value = min_t(u16, w_length, value);
}
break;
}
@ -2156,8 +2154,8 @@ int composite_os_desc_req_prepare(struct usb_composite_dev *cdev,
goto end;
}
/* OS feature descriptor length <= 4kB */
cdev->os_desc_req->buf = kmalloc(4096, GFP_KERNEL);
cdev->os_desc_req->buf = kmalloc(USB_COMP_EP0_OS_DESC_BUFSIZ,
GFP_KERNEL);
if (!cdev->os_desc_req->buf) {
ret = -ENOMEM;
usb_ep_free_request(ep0, cdev->os_desc_req);

3
include/linux/usb/composite.h
View File

@ -54,6 +54,9 @@
/* big enough to hold our biggest descriptor */
#define USB_COMP_EP0_BUFSIZ 1024
/* OS feature descriptor length <= 4kB */
#define USB_COMP_EP0_OS_DESC_BUFSIZ 4096
#define USB_MS_TO_HS_INTERVAL(x) (ilog2((x * 1000 / 125)) + 1)
struct usb_configuration;