diff options
| author | Jakob Koschel <jakobkoschel@gmail.com> | 2022-03-08 18:17:55 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-15 18:19:43 +0100 |
| commit | 109122f36f34bc692ccf08b7dace705b0ad96542 (patch) | |
| tree | 18e8a1b3b7bd46661135c2c7172b258309bd3929 | |
| parent | b6af554427adf9b5960295305d698442680f7caa (diff) | |
usb: gadget: udc: atmel: remove usage of list iterator past the loop body
If the list representing the request queue does not contain the expected
request, the value of the list_for_each_entry() iterator will not point
to a valid structure. To avoid type confusion in such case, the list
iterator scope will be limited to the list_for_each_entry() loop.
In preparation to limiting scope of the list iterator to the list traversal
loop, use a dedicated pointer to point to the found request object [1].
Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Link: https://lore.kernel.org/r/20220308171818.384491-4-jakobkoschel@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/udc/atmel_usba_udc.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/gadget/udc/atmel_usba_udc.c b/drivers/usb/gadget/udc/atmel_usba_udc.c index 2b893bceea45..ae2bfbac603e 100644 --- a/drivers/usb/gadget/udc/atmel_usba_udc.c +++ b/drivers/usb/gadget/udc/atmel_usba_udc.c @@ -860,7 +860,8 @@ static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) { struct usba_ep *ep = to_usba_ep(_ep); struct usba_udc *udc = ep->udc; - struct usba_request *req; + struct usba_request *req = NULL; + struct usba_request *iter; unsigned long flags; u32 status; @@ -869,12 +870,14 @@ static int usba_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) spin_lock_irqsave(&udc->lock, flags); - list_for_each_entry(req, &ep->queue, queue) { - if (&req->req == _req) - break; + list_for_each_entry(iter, &ep->queue, queue) { + if (&iter->req != _req) + continue; + req = iter; + break; } - if (&req->req != _req) { + if (!req) { spin_unlock_irqrestore(&udc->lock, flags); return -EINVAL; } |