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>

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 77c7ecca816aa026677ec869e087f0dc747f55a7..b8b629c615d377e969ba71240665eb19d8ed50b8 100644 (file)
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -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);

diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index cef0e44601f82b30b8e52d57fbcb2ede3bf6ea60..4b6b9283fa7bf69c1e5459e259a548c90de3d742 100644 (file)
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -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;