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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-09-11 04:34:46 -0300
commit863981e96738983919de841ec669e157e6bdaeb0 (patch)
treed6d89a12e7eb8017837c057935a2271290907f76 /drivers/usb/gadget/composite.c
parent8dec7c70575785729a6a9e6719a955e9c545bcab (diff)
Linux-libre 4.7.1-gnupck-4.7.1-gnu
Diffstat (limited to 'drivers/usb/gadget/composite.c')
-rw-r--r--drivers/usb/gadget/composite.c43
1 files changed, 32 insertions, 11 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 524e233d4..eb648485a 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -66,20 +66,36 @@ function_descriptors(struct usb_function *f,
{
struct usb_descriptor_header **descriptors;
+ /*
+ * NOTE: we try to help gadget drivers which might not be setting
+ * max_speed appropriately.
+ */
+
switch (speed) {
case USB_SPEED_SUPER_PLUS:
descriptors = f->ssp_descriptors;
- break;
+ if (descriptors)
+ break;
+ /* FALLTHROUGH */
case USB_SPEED_SUPER:
descriptors = f->ss_descriptors;
- break;
+ if (descriptors)
+ break;
+ /* FALLTHROUGH */
case USB_SPEED_HIGH:
descriptors = f->hs_descriptors;
- break;
+ if (descriptors)
+ break;
+ /* FALLTHROUGH */
default:
descriptors = f->fs_descriptors;
}
+ /*
+ * if we can't find any descriptors at all, then this gadget deserves to
+ * Oops with a NULL pointer dereference
+ */
+
return descriptors;
}
@@ -1852,14 +1868,19 @@ unknown:
}
break;
}
- req->length = value;
- req->context = cdev;
- req->zero = value < w_length;
- value = composite_ep0_queue(cdev, req, GFP_ATOMIC);
- if (value < 0) {
- DBG(cdev, "ep_queue --> %d\n", value);
- req->status = 0;
- composite_setup_complete(gadget->ep0, req);
+
+ if (value >= 0) {
+ req->length = value;
+ req->context = cdev;
+ req->zero = value < w_length;
+ value = composite_ep0_queue(cdev, req,
+ GFP_ATOMIC);
+ if (value < 0) {
+ DBG(cdev, "ep_queue --> %d\n", value);
+ req->status = 0;
+ composite_setup_complete(gadget->ep0,
+ req);
+ }
}
return value;
}