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media: uvcvideo: Fix dereference of out-of-bound list iterator 

Fixes the following coccinelle report:

drivers/media/usb/uvc/uvc_ctrl.c:1860:5-11:
ERROR: invalid reference to the index variable of the iterator on line 1854

by adding a boolean variable to check if the loop has found the

Found using - Coccinelle (http://coccinelle.lip6.fr)

[Replace cursor variable with bool found]

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Daniel W. S. Almeida 2020-08-07 10:35:30 +02:00 committed by Mauro Carvalho Chehab
parent f5a3048a84
commit f875bcc375
1 changed files with 9 additions and 4 deletions
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13
drivers/media/usb/uvc/uvc_ctrl.c
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@ -1844,30 +1844,35 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
{
struct uvc_entity *entity;
struct uvc_control *ctrl;
unsigned int i, found = 0;
unsigned int i;
bool found;
u32 reqflags;
u16 size;
u8 *data = NULL;
int ret;
/* Find the extension unit. */
found = false;
list_for_each_entry(entity, &chain->entities, chain) {
if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT &&
entity->id == xqry->unit)
entity->id == xqry->unit) {
found = true;
break;
}
}
if (entity->id != xqry->unit) {
if (!found) {
uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n",
xqry->unit);
return -ENOENT;
}
/* Find the control and perform delayed initialization if needed. */
found = false;
for (i = 0; i < entity->ncontrols; ++i) {
ctrl = &entity->controls[i];
if (ctrl->index == xqry->selector - 1) {
found = 1;
found = true;
break;
}
}