diff options
| author |   Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2022-07-18 13:56:54 +0200 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@kernel.org> | 2022-08-30 16:05:00 +0200 |
| commit | c58874df1051c2baee8dabb8c476c3e476923923 (patch) | |
| tree | afcef942c9ac49c9efc48bbd5833a0e0a2bf6c02 /drivers/media/usb/uvc/uvc_ctrl.c | |
| parent | media: uvcvideo: Fix memory leak in uvc_gpio_parse (diff) | |
| download | wireguard-linux-c58874df1051c2baee8dabb8c476c3e476923923.tar.xz wireguard-linux-c58874df1051c2baee8dabb8c476c3e476923923.zip | |
media: uvcvideo: Use indexed loops in uvc_ctrl_init_ctrl()
As shown by the bug introduced in commit 86f7ef773156 ("media: uvcvideo:
Add support for per-device control mapping overrides"), the loop style
used by uvc_ctrl_init_ctrl() is error-prone. Rewrite the loops to use
indices instead.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'drivers/media/usb/uvc/uvc_ctrl.c')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_ctrl.c | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 8c208db9600b..5c33b0b7ef9a 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -2411,10 +2411,9 @@ static void uvc_ctrl_prune_entity(struct uvc_device *dev, static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, struct uvc_control *ctrl) { - 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; - const struct uvc_control_mapping *mend; + const struct uvc_control_mapping *mappings; + unsigned int num_mappings; + unsigned int i; /* * XU controls initialization requires querying the device for control @@ -2425,7 +2424,9 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT) return; - for (; info < iend; ++info) { + for (i = 0; i < ARRAY_SIZE(uvc_ctrls); ++i) { + const struct uvc_control_info *info = &uvc_ctrls[i]; + if (uvc_entity_match_guid(ctrl->entity, info->entity) && ctrl->index == info->index) { uvc_ctrl_add_info(chain->dev, ctrl, info); @@ -2452,9 +2453,11 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, */ if (chain->dev->info->mappings) { bool custom = false; - unsigned int i; - for (i = 0; (mapping = chain->dev->info->mappings[i]); ++i) { + for (i = 0; chain->dev->info->mappings[i]; ++i) { + const struct uvc_control_mapping *mapping = + chain->dev->info->mappings[i]; + if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && ctrl->info.selector == mapping->selector) { __uvc_ctrl_add_mapping(chain, ctrl, mapping); @@ -2467,10 +2470,9 @@ 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 (i = 0; i < ARRAY_SIZE(uvc_ctrl_mappings); ++i) { + const struct uvc_control_mapping *mapping = &uvc_ctrl_mappings[i]; - for (; mapping < mend; ++mapping) { if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && ctrl->info.selector == mapping->selector) __uvc_ctrl_add_mapping(chain, ctrl, mapping); @@ -2478,14 +2480,16 @@ static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain, /* Finally process version-specific mappings. */ if (chain->dev->uvc_version < 0x0150) { - mapping = uvc_ctrl_mappings_uvc11; - mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings_uvc11); + mappings = uvc_ctrl_mappings_uvc11; + num_mappings = ARRAY_SIZE(uvc_ctrl_mappings_uvc11); } else { - mapping = uvc_ctrl_mappings_uvc15; - mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings_uvc15); + mappings = uvc_ctrl_mappings_uvc15; + num_mappings = ARRAY_SIZE(uvc_ctrl_mappings_uvc15); } - for (; mapping < mend; ++mapping) { + for (i = 0; i < num_mappings; ++i) { + const struct uvc_control_mapping *mapping = &mappings[i]; + if (uvc_entity_match_guid(ctrl->entity, mapping->entity) && ctrl->info.selector == mapping->selector) __uvc_ctrl_add_mapping(chain, ctrl, mapping); |