Re: [PATCH v7 2/8] media: uvcvideo: Add support for per-device control mapping overrides

From: Dan Carpenter
Date: Thu Jun 30 2022 - 07:08:20 EST

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Hi Ricardo,

url: https://github.com/intel-lab-lkp/linux/commits/Ricardo-Ribalda/uvcvideo-Fix-handling-of-power_line_frequency/20220617-185644
base: git://linuxtv.org/media_tree.git master
config: microblaze-randconfig-m031-20220629 (https://download.01.org/0day-ci/archive/20220630/202206301144.r7yv0yk2-lkp@xxxxxxxxx/config)
compiler: microblaze-linux-gcc (GCC) 11.3.0

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/media/usb/uvc/uvc_ctrl.c:2459 uvc_ctrl_init_ctrl() error: uninitialized symbol 'mapping'.

vim +/mapping +2459 drivers/media/usb/uvc/uvc_ctrl.c

866c6bdd5663d4 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2021-06-18 2401 static void uvc_ctrl_init_ctrl(struct uvc_video_chain *chain,
866c6bdd5663d4 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2021-06-18 2402 struct uvc_control *ctrl)
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2403 {
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2404 const struct uvc_control_info *info = uvc_ctrls;
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2405 const struct uvc_control_info *iend = info + ARRAY_SIZE(uvc_ctrls);
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2406 const struct uvc_control_mapping *mapping;
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2407 const struct uvc_control_mapping *mend;
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2408
52c58ad6f95ff6 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2409 /* XU controls initialization requires querying the device for control
52c58ad6f95ff6 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2410 * information. As some buggy UVC devices will crash when queried
52c58ad6f95ff6 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2411 * repeatedly in a tight loop, delay XU controls initialization until
52c58ad6f95ff6 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2412 * first use.
52c58ad6f95ff6 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2413 */
52c58ad6f95ff6 drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2414 if (UVC_ENTITY_TYPE(ctrl->entity) == UVC_VC_EXTENSION_UNIT)
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2415 return;
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2416
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2417 for (; info < iend; ++info) {
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2418 if (uvc_entity_match_guid(ctrl->entity, info->entity) &&
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2419 ctrl->index == info->index) {
866c6bdd5663d4 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2021-06-18 2420 uvc_ctrl_add_info(chain->dev, ctrl, info);
93df48d37c3f03 drivers/media/usb/uvc/uvc_ctrl.c Hans de Goede 2020-07-28 2421 /*
93df48d37c3f03 drivers/media/usb/uvc/uvc_ctrl.c Hans de Goede 2020-07-28 2422 * Retrieve control flags from the device. Ignore errors
93df48d37c3f03 drivers/media/usb/uvc/uvc_ctrl.c Hans de Goede 2020-07-28 2423 * and work with default flag values from the uvc_ctrl
93df48d37c3f03 drivers/media/usb/uvc/uvc_ctrl.c Hans de Goede 2020-07-28 2424 * array when the device doesn't properly implement
93df48d37c3f03 drivers/media/usb/uvc/uvc_ctrl.c Hans de Goede 2020-07-28 2425 * GET_INFO on standard controls.
93df48d37c3f03 drivers/media/usb/uvc/uvc_ctrl.c Hans de Goede 2020-07-28 2426 */
866c6bdd5663d4 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2021-06-18 2427 uvc_ctrl_get_flags(chain->dev, ctrl, &ctrl->info);
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2428 break;
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2429 }
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2430 }
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2431
071c8bb827c80a drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2432 if (!ctrl->initialized)
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2433 return;
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2434
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2435 /*
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2436 * First check if the device provides a custom mapping for this control,
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2437 * used to override standard mappings for non-conformant devices. Don't
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2438 * process standard mappings if a custom mapping is found. This
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2439 * mechanism doesn't support combining standard and custom mappings for
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2440 * a single control.
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2441 */
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2442 if (chain->dev->info->mappings) {
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2443 bool custom = false;
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2444 unsigned int i;
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2445
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2446 for (i = 0; (mapping = chain->dev->info->mappings[i]); ++i) {
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2447 if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2448 ctrl->info.selector == mapping->selector) {
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2449 __uvc_ctrl_add_mapping(chain, ctrl, mapping);
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2450 custom = true;
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2451 }
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2452 }
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2453
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2454 if (custom)
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2455 return;
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2456 }

"mapping" uninitialized if chain->dev->info->mappings is NULL.

10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2457
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2458 /* Process common mappings next. */
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 @2459 mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings);
^^^^^^^

10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2460 for (mapping = uvc_ctrl_mappings; mapping < mend; ++mapping) {

I'm surprised this made it through testing... Anyway, the easier way to
to iterate through an array of structs is just say:

for (i = 0; i < ARRAY_SIZE(uvc_ctrl_mappings); i++) {
mapping = &uvc_ctrl_mappings[i];

87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2461 if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2462 ctrl->info.selector == mapping->selector)
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2463 __uvc_ctrl_add_mapping(chain, ctrl, mapping);
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2464 }
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2465
10bdca4191d7a8 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2466 /* Finally process version-specific mappings. */
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2467 if (chain->dev->uvc_version < 0x0150) {
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2468 mapping = uvc_ctrl_mappings_uvc11;
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2469 mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings_uvc11);
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2470 } else {
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2471 mapping = uvc_ctrl_mappings_uvc15;
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2472 mend = mapping + ARRAY_SIZE(uvc_ctrl_mappings_uvc15);
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2473 }
87c205087585a0 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2022-06-17 2474
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2475 for (; mapping < mend; ++mapping) {
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2476 if (uvc_entity_match_guid(ctrl->entity, mapping->entity) &&
071c8bb827c80a drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-29 2477 ctrl->info.selector == mapping->selector)
866c6bdd5663d4 drivers/media/usb/uvc/uvc_ctrl.c Ricardo Ribalda 2021-06-18 2478 __uvc_ctrl_add_mapping(chain, ctrl, mapping);
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2479 }
ba2fa99668bb9b drivers/media/video/uvc/uvc_ctrl.c Laurent Pinchart 2010-09-20 2480 }

--
0-DAY CI Kernel Test Service
https://01.org/lkp

Next message: Greg Kroah-Hartman: "Re: [PATCH v2 -next] usb: gadget: dereference before null check"
Previous message: AngeloGioacchino Del Regno: "[PATCH] dt-bindings: pinctrl: mt8195: Add gpio-line-names property"
Next in thread: Ricardo Ribalda: "Re: [PATCH v7 2/8] media: uvcvideo: Add support for per-device control mapping overrides"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]