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| author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2022-07-18 14:12:19 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-07-27 20:25:59 +0200 |
| commit | 21b1b6797fbe4fb5863c96f350359d0e982faddd (patch) | |
| tree | 786ce7fccc989e60bc9ab9a46c20821f26e6ddb0 /drivers/media/usb | |
| parent | media: Documentation: mc-core: Fix typo (diff) | |
| download | linux-21b1b6797fbe4fb5863c96f350359d0e982faddd.tar.xz linux-21b1b6797fbe4fb5863c96f350359d0e982faddd.zip | |
media: uvcvideo: Fix invalid pointer in uvc_ctrl_init_ctrl()
The handling of per-device mappings introduced in commit 86f7ef773156
("media: uvcvideo: Add support for per-device control mapping
overrides") overwrote the mapping variable after it was initialized and
before it was used, leading to usage of an invalid pointer for devices
with per-device mappings. Fix it.
Fixes: 86f7ef773156 ("media: uvcvideo: Add support for per-device control mapping overrides")
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media/usb')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_ctrl.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index e4826a846861..8c208db9600b 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -2413,9 +2413,8 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, { const struct uvc_control_info *info = uvc_ctrls; const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls); - const struct uvc_control_mapping *mapping = uvc_ctrl_mappings; - const struct uvc_control_mapping *mend = - mapping + ARRAY_SIZE(uvc_ctrl_mappings); + const struct uvc_control_mapping *mapping; + const struct uvc_control_mapping *mend; /* * XU controls initialization requires querying the device for control @@ -2468,6 +2467,9 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, } /* Process common mappings next. */ + mapping = uvc_ctrl_mappings; + mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings); + for (; mapping < mend; ++mapping) { if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && ctrl->info.selector == mapping->selector) |