From 5efb6c65a028869fb9a1eae729a21585be8569cd Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 24 Jul 2007 08:07:17 -0400 Subject: [PATCH] V4L: Add check for valid control ID to v4l2_ctrl_next If v4l2_ctrl_next is called without the V4L2_CTRL_FLAG_NEXT_CTRL then it should check whether the passed control ID is valid and return 0 if it isn't. Otherwise a for-loop over the control IDs will never end. (cherry picked from commit a46c5fbc6912c4e34cb7ded314249b639dc244a6) Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Michael Krufky Signed-off-by: Greg Kroah-Hartman --- drivers/media/video/v4l2-common.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c index 13ee550d3215..d2915d3530ea 100644 --- a/drivers/media/video/v4l2-common.c +++ b/drivers/media/video/v4l2-common.c @@ -939,16 +939,25 @@ int v4l2_ctrl_query_menu(struct v4l2_querymenu *qmenu, struct v4l2_queryctrl *qc When no more controls are available 0 is returned. */ u32 v4l2_ctrl_next(const u32 * const * ctrl_classes, u32 id) { - u32 ctrl_class; + u32 ctrl_class = V4L2_CTRL_ID2CLASS(id); const u32 *pctrl; - /* if no query is desired, then just return the control ID */ - if ((id & V4L2_CTRL_FLAG_NEXT_CTRL) == 0) - return id; if (ctrl_classes == NULL) return 0; + + /* if no query is desired, then check if the ID is part of ctrl_classes */ + if ((id & V4L2_CTRL_FLAG_NEXT_CTRL) == 0) { + /* find class */ + while (*ctrl_classes && V4L2_CTRL_ID2CLASS(**ctrl_classes) != ctrl_class) + ctrl_classes++; + if (*ctrl_classes == NULL) + return 0; + pctrl = *ctrl_classes; + /* find control ID */ + while (*pctrl && *pctrl != id) pctrl++; + return *pctrl ? id : 0; + } id &= V4L2_CTRL_ID_MASK; - ctrl_class = V4L2_CTRL_ID2CLASS(id); id++; /* select next control */ /* find first class that matches (or is greater than) the class of the ID */ -- 2.39.5