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| author | Jakob Koschel <jakobkoschel@gmail.com> | 2022-03-08 18:17:58 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-15 18:19:43 +0100 |
| commit | 7336cccf04f9f88b7eb3ae9003ba169b473aeaad (patch) | |
| tree | d19a6b4e24f96bd17eb714d401bee88ee2beaa5a /drivers/usb | |
| parent | 2390ea9c07167e538ce161f57f62b7d8231f6d73 (diff) | |
| download | linux-7336cccf04f9f88b7eb3ae9003ba169b473aeaad.tar.gz linux-7336cccf04f9f88b7eb3ae9003ba169b473aeaad.tar.bz2 linux-7336cccf04f9f88b7eb3ae9003ba169b473aeaad.zip | |
usb: gadget: goku_udc: 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/20220308171818.384491-7-jakobkoschel@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/gadget/udc/goku_udc.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/usb/gadget/udc/goku_udc.c b/drivers/usb/gadget/udc/goku_udc.c index 3757a772a55e..bdc56b24b5c9 100644 --- a/drivers/usb/gadget/udc/goku_udc.c +++ b/drivers/usb/gadget/udc/goku_udc.c @@ -809,7 +809,7 @@ static void nuke(struct goku_ep *ep, int status) /* dequeue JUST ONE request */ static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req) { - struct goku_request *req; + struct goku_request *req = NULL, *iter; struct goku_ep *ep; struct goku_udc *dev; unsigned long flags; @@ -833,11 +833,13 @@ static int goku_dequeue(struct usb_ep *_ep, struct usb_request *_req) spin_lock_irqsave(&dev->lock, flags); /* make sure it's actually queued on this endpoint */ - 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 (&dev->lock, flags); return -EINVAL; } |