diff options
| author | Bryan Wu <cooloney@kernel.org> | 2009-01-07 19:21:19 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@kvm.kroah.org> | 2009-01-28 03:15:35 +0300 |
| commit | 08889517b3713926169d79d99782192e86acdc67 (patch) | |
| tree | 8d5a6641ef9e96fa100d08bf67603989cf90e00c /drivers/usb/gadget/composite.c | |
| parent | dd4dff8b035f6dda69ece98e20d4c2d76b9f97d1 (diff) | |
| download | linux-08889517b3713926169d79d99782192e86acdc67.tar.xz | |
USB: composite: Fix bug: low byte of w_index is the usb interface number not the whole 2 bytes of w_index
In some usb gadget driver, for example usb audio class device, the high
byte of w_index is the entity id and low byte is the interface number.
If we use the 2 bytes of w_index as the array number, we will get a
wrong pointer or NULL pointer.
This patch fixes this issue.
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/composite.c')
| -rw-r--r-- | drivers/usb/gadget/composite.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 363951eb333c..5d11c291f1ad 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -683,6 +683,7 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) struct usb_request *req = cdev->req; int value = -EOPNOTSUPP; u16 w_index = le16_to_cpu(ctrl->wIndex); + u8 intf = w_index & 0xFF; u16 w_value = le16_to_cpu(ctrl->wValue); u16 w_length = le16_to_cpu(ctrl->wLength); struct usb_function *f = NULL; @@ -769,7 +770,7 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) goto unknown; if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) break; - f = cdev->config->interface[w_index]; + f = cdev->config->interface[intf]; if (!f) break; if (w_value && !f->set_alt) @@ -781,7 +782,7 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) goto unknown; if (!cdev->config || w_index >= MAX_CONFIG_INTERFACES) break; - f = cdev->config->interface[w_index]; + f = cdev->config->interface[intf]; if (!f) break; /* lots of interfaces only need altsetting zero... */ @@ -808,7 +809,7 @@ unknown: */ if ((ctrl->bRequestType & USB_RECIP_MASK) == USB_RECIP_INTERFACE) { - f = cdev->config->interface[w_index]; + f = cdev->config->interface[intf]; if (f && f->setup) value = f->setup(f, ctrl); else |