Messages in this thread Patch in this message | | | From | Jakob Koschel <> | Subject | [PATCH 20/26] usb: gadget: tegra-xudc: remove using list iterator after loop body as a ptr | Date | Sun, 6 Mar 2022 18:50:28 +0100 |
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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> --- drivers/usb/gadget/udc/tegra-xudc.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c index 43f1b0d461c1..7c39d8a9e49d 100644 --- a/drivers/usb/gadget/udc/tegra-xudc.c +++ b/drivers/usb/gadget/udc/tegra-xudc.c @@ -1413,18 +1413,20 @@ __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, *tmp; 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) + list_for_each_entry(tmp, &ep->queue, list) { + if (tmp == req) { + r = tmp; break; + } } - if (r != req) + if (!r) return -EINVAL; /* Request hasn't been queued in the transfer ring yet. */ -- 2.25.1
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