Messages in this thread Patch in this message | | | From | Jakob Koschel <> | Subject | [PATCH v2 21/26] usb: gadget: composite: remove check of list iterator against head past the loop body | Date | Tue, 8 Mar 2022 18:18:13 +0100 |
| |
When list_for_each_entry() completes the iteration over the whole list without breaking the loop, the iterator value will be a bogus pointer computed based on the head element.
While it is safe to use the pointer to determine if it was computed based on the head element, either with list_entry_is_head() or &pos->member == head, using the iterator variable after the loop should be avoided.
In preparation to limiting the scope of a list iterator to the list traversal loop, use a dedicated pointer to point to the found element [1].
Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/ Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com> --- drivers/usb/gadget/composite.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 9315313108c9..4f7e789c3e07 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1690,6 +1690,7 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) u16 w_value = le16_to_cpu(ctrl->wValue); u16 w_length = le16_to_cpu(ctrl->wLength); struct usb_function *f = NULL; + struct usb_function *iter; u8 endp; if (w_length > USB_COMP_EP0_BUFSIZ) { @@ -2046,12 +2047,12 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) if (!cdev->config) break; endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f); - list_for_each_entry(f, &cdev->config->functions, list) { - if (test_bit(endp, f->endpoints)) + list_for_each_entry(iter, &cdev->config->functions, list) { + if (test_bit(endp, iter->endpoints)) { + f = iter; break; + } } - if (&f->list == &cdev->config->functions) - f = NULL; break; } try_fun_setup: -- 2.25.1
| |