From: "Daniel W. S. Almeida" <dwlsalmeida@xxxxxxxxx> 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 introducing a temporary variable to iterate the list. Do not dereference the 'entity' pointer if it is not found in the list. Found using - Coccinelle (http://coccinelle.lip6.fr) Signed-off-by: Daniel W. S. Almeida <dwlsalmeida@xxxxxxxxx> --- drivers/media/usb/uvc/uvc_ctrl.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index e399b9fad757..567bdedc2ff2 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1842,7 +1842,8 @@ static int uvc_ctrl_init_xu_ctrl(struct uvc_device *dev, int uvc_xu_ctrl_query(struct uvc_video_chain *chain, struct uvc_xu_control_query *xqry) { - struct uvc_entity *entity; + struct uvc_entity *entity = NULL; + struct uvc_entity *cursor = NULL; struct uvc_control *ctrl; unsigned int i, found = 0; u32 reqflags; @@ -1851,13 +1852,15 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain, int ret; /* Find the extension unit. */ - list_for_each_entry(entity, &chain->entities, chain) { - if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT && - entity->id == xqry->unit) + list_for_each_entry(cursor, &chain->entities, chain) { + if (UVC_ENTITY_TYPE(cursor) == UVC_VC_EXTENSION_UNIT && + cursor->id == xqry->unit) { + entity = cursor; break; + } } - if (entity->id != xqry->unit) { + if (!entity || entity->id != xqry->unit) { uvc_trace(UVC_TRACE_CONTROL, "Extension unit %u not found.\n", xqry->unit); return -ENOENT; -- 2.28.0
