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| author | Rob Herring <robh@kernel.org> | 2015-07-24 10:14:21 -0500 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2015-07-24 22:08:38 +0200 |
| commit | 58d6d139c3e7bb923029e7ba18bfec7f420ead0f (patch) | |
| tree | a4c59e5fe253f4f535e90e174a8f6b728dfd8f73 /drivers/usb/gadget | |
| parent | 85a9ea314e36fc42656bc93c9e3d83d58b595d3e (diff) | |
| download | u-boot-imx-58d6d139c3e7bb923029e7ba18bfec7f420ead0f.zip u-boot-imx-58d6d139c3e7bb923029e7ba18bfec7f420ead0f.tar.gz u-boot-imx-58d6d139c3e7bb923029e7ba18bfec7f420ead0f.tar.bz2 | |
usb: ci_udc: fix request allocation when endpoints are disabled
The ci_udc driver request allocation assumes that the endpoint descriptor
pointer is set to retrieve the endpoint number, but that is only true
when the endpoint is enabled. This results in a NULL ptr dereference
which for me happens to return 0 value. This causes the EP0 request
struct to be returned for other endpoints. Some gadget drivers like
fastboot and USB MS work fine, but ethernet does not.
Really, the ci_udc driver is the oddball here doing this EP0 special
case handling Stephen added. All the other drivers alloc/free functions
are pretty much the same with the only variation being the size of the
private struct. This could all be consolidated to a common function.
Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Marek Vasut <marex@denx.de>
Acked-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/usb/gadget')
| -rw-r--r-- | drivers/usb/gadget/ci_udc.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c index 993be31..3e8eb87 100644 --- a/drivers/usb/gadget/ci_udc.c +++ b/drivers/usb/gadget/ci_udc.c @@ -258,10 +258,12 @@ static struct usb_request * ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags) { struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep); - int num; + int num = -1; struct ci_req *ci_req; - num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK; + if (ci_ep->desc) + num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK; + if (num == 0 && controller.ep0_req) return &controller.ep0_req->req; @@ -281,9 +283,11 @@ static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *req) { struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep); struct ci_req *ci_req = container_of(req, struct ci_req, req); - int num; + int num = -1; + + if (ci_ep->desc) + num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK; - num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK; if (num == 0) { if (!controller.ep0_req) return; |