linux-kernel - [PATCH v2 0/3] media: Fix gcc warnings

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Message-Id: <20240325-gcc-arm-warnings-v2-0-47523cf5c8ca@chromium.org>
Date: Mon, 25 Mar 2024 14:19:52 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Sowjanya Komatineni <skomatineni@...dia.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-tegra@...r.kernel.org, 
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 0/3] media: Fix gcc warnings

drivers/staging/media/tegra-video/tegra20.c: In function ‘tegra20_vip_start_streaming’:
    drivers/staging/media/tegra-video/tegra20.c:624:72: warning: ‘yuv_input_format’ may be used uninitialized [-Wmaybe-uninitialized]
      624 |                          VI_INPUT_VIP_INPUT_ENABLE | main_input_format | yuv_input_format);
    drivers/staging/media/tegra-video/tegra20.c:617:22: note: ‘yuv_input_format’ was declared here
      617 |         unsigned int yuv_input_format;
          |                      ^~~~~~~~~~~~~~~~
    drivers/media/radio/radio-shark2.c: In function ‘usb_shark_probe’:
    drivers/media/radio/radio-shark2.c:191:17: warning: ‘%s’ directive output may be truncated writing up to 35 bytes into a region of size 32 [-Wformat-truncation=]
      191 |                 .name           = "%s:blue:",
          |                 ^
    In function ‘shark_register_leds’,
        inlined from ‘usb_shark_probe’ at drivers/media/radio/radio-shark2.c:306:11:
    drivers/media/radio/radio-shark2.c:212:17: note: ‘snprintf’ output between 7 and 42 bytes into a destination of size 32
      212 |                 snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      213 |                          shark->leds[i].name, shark->v4l2_dev.name);
          |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    drivers/media/radio/radio-shark2.c: In function ‘usb_shark_probe’:
    drivers/media/radio/radio-shark2.c:197:17: warning: ‘%s’ directive output may be truncated writing up to 35 bytes into a region of size 32 [-Wformat-truncation=]
      197 |                 .name           = "%s:red:",
          |                 ^
    In function ‘shark_register_leds’,
        inlined from ‘usb_shark_probe’ at drivers/media/radio/radio-shark2.c:306:11:
    drivers/media/radio/radio-shark2.c:212:17: note: ‘snprintf’ output between 6 and 41 bytes into a destination of size 32
      212 |                 snprintf(shark->led_names[i], sizeof(shark->led_names[0]),
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      213 |                          shark->leds[i].name, shark->v4l2_dev.name);
          |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      AR      drivers/staging/media/tegra-video/built-in.a
      AR      drivers/staging/media/built-in.a
    In file included from ./include/asm-generic/preempt.h:5,
                     from ./arch/arm/include/generated/asm/preempt.h:1,
                     from ./include/linux/preempt.h:79,
                     from ./include/linux/spinlock.h:56,
                     from ./include/linux/mmzone.h:8,
                     from ./include/linux/gfp.h:7,
                     from ./include/linux/umh.h:4,
                     from ./include/linux/kmod.h:9,
                     from ./include/linux/module.h:17,
                     from drivers/media/dvb-core/dvbdev.c:15:
    In function ‘check_object_size’,
        inlined from ‘check_copy_size’ at ./include/linux/thread_info.h:251:2,
        inlined from ‘copy_from_user’ at ./include/linux/uaccess.h:182:6,
        inlined from ‘dvb_usercopy’ at drivers/media/dvb-core/dvbdev.c:987:7:
    ./include/linux/thread_info.h:215:17: warning: ‘sbuf’ may be used uninitialized [-Wmaybe-uninitialized]
      215 |                 __check_object_size(ptr, n, to_user);
          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ./include/linux/thread_info.h: In function ‘dvb_usercopy’:
    ./include/linux/thread_info.h:208:13: note: by argument 1 of type ‘const void *’ to ‘__check_object_size’ declared here
      208 | extern void __check_object_size(const void *ptr, unsigned long n,
          |             ^~~~~~~~~~~~~~~~~~~
    drivers/media/dvb-core/dvbdev.c:959:17: note: ‘sbuf’ declared here
      959 |         char    sbuf[128];
          |                 ^~~~
      AR      drivers/media/radio/built-in.a

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
Changes in v2: Thanks Thierry
- Make tegra20_vi_get_output_formats() and tegra20_vi_get_inut_formats,
  consistent.
- Link to v1: https://lore.kernel.org/r/20240323-gcc-arm-warnings-v1-0-0b45cc52f39e@chromium.org

---
Ricardo Ribalda (3):
      staging: media: tegra-video: Fix -Wmaybe-unitialized warn in gcc
      media: radio-shark2: Avoid led_names truncations
      media: dvbdev: Initialize sbuf

 drivers/media/dvb-core/dvbdev.c             | 2 +-
 drivers/media/radio/radio-shark2.c          | 2 +-
 drivers/staging/media/tegra-video/tegra20.c | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)
---
base-commit: b14257abe7057def6127f6fb2f14f9adc8acabdb
change-id: 20240323-gcc-arm-warnings-e4c142cb5ac0

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>