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usb: gadget: tegra-xudc: remove using list iterator after loop body as a ptr 

If the list does not contain the expected element, the value of
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 list_for_each_entry() loop.

In preparation to limiting scope of a list iterator to the list traversal
loop, use a dedicated pointer to point to the found element [1].
Determining if an element was found is then simply checking if
the pointer is != NULL instead of using the potentially bogus pointer.

Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/
Signed-off-by: Jakob Koschel <jakobkoschel@gmail.com>
Link: https://lore.kernel.org/r/20220308171818.384491-21-jakobkoschel@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jakob Koschel 2022-03-08 18:18:12 +01:00 committed by Greg Kroah-Hartman
parent b832eb1d57
commit 418947745c
1 changed files with 7 additions and 5 deletions
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12
drivers/usb/gadget/udc/tegra-xudc.c
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@ -1412,18 +1412,20 @@ __tegra_xudc_ep_dequeue(struct tegra_xudc_ep *ep,
struct tegra_xudc_request *req)
{
struct tegra_xudc *xudc = ep->xudc;
struct tegra_xudc_request *r;
struct tegra_xudc_request *r = NULL, *iter;
struct tegra_xudc_trb *deq_trb;
bool busy, kick_queue = false;
int ret = 0;
/* Make sure the request is actually queued to this endpoint. */
list_for_each_entry(r, &ep->queue, list) {
if (r == req)
break;
list_for_each_entry(iter, &ep->queue, list) {
if (iter != req)
continue;
r = iter;
break;
}
if (r != req)
if (!r)
return -EINVAL;
/* Request hasn't been queued in the transfer ring yet. */