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authorBryan Wu <cooloney@kernel.org>2009-01-07 17:21:19 +0100
committerGreg Kroah-Hartman <gregkh@kvm.kroah.org>2009-01-28 01:15:35 +0100
commit08889517b3713926169d79d99782192e86acdc67 (patch)
tree8d5a6641ef9e96fa100d08bf67603989cf90e00c /drivers/usb/gadget/composite.c
parentUSB: composite: Fix bug: should test set_alt function pointer before use it (diff)
downloadlinux-08889517b3713926169d79d99782192e86acdc67.tar.xz
linux-08889517b3713926169d79d99782192e86acdc67.zip
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 '')
-rw-r--r--drivers/usb/gadget/composite.c7
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