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authorHans Verkuil <hverkuil@xs4all.nl>2007-07-24 08:07:17 -0400
committerWilly Tarreau <w@1wt.eu>2007-08-25 17:24:03 +0200
commit7dbd515d60f8e0b4f3ab6f62cf5cb1606d62e654 (patch)
tree38193ea172fb2222673ab2467796fd4b75b02378
parentf87acefea8a786d3fe490f0f0b2c635973f619ec (diff)
[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 <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Michael Krufky <mkrufky@linuxtv.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r--drivers/media/video/v4l2-common.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/media/video/v4l2-common.c b/drivers/media/video/v4l2-common.c
index b87d571e0463..31807ba8fffe 100644
--- a/drivers/media/video/v4l2-common.c
+++ b/drivers/media/video/v4l2-common.c
@@ -1499,16 +1499,25 @@ 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 */