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media: exynos4-is: properly initialize frame format 

We copy the subdev frame format from a partially initialized
structure, which is not entirely well-defined. Older compilers
like gcc-4.4 can copy uninitialized stack data here and warn
about it:

drivers/media/platform/exynos4-is/fimc-isp.c: In function 'fimc_isp_subdev_open':
drivers/media/platform/exynos4-is/fimc-isp.c:379: error: 'fmt.reserved[10u]' may be used uninitialized in this function
drivers/media/platform/exynos4-is/fimc-isp.c:379: error: 'fmt.reserved[9u]' may be used uninitialized in this function
...
drivers/media/platform/exynos4-is/fimc-isp.c:379: error: 'fmt.reserved[0u]' may be used uninitialized in this function
drivers/media/platform/exynos4-is/fimc-isp.c:379: error: 'fmt.xfer_func' may be used uninitialized in this function

On newer compilers, only the initialized fields get copied, but
we should not rely on that, so this changes the code to zero-out
the remaining fields first.

Fixes: 9a761e4368 ("[media] exynos4-is: Add Exynos4x12 FIMC-IS driver")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Arnd Bergmann 2017-09-15 15:54:34 -04:00 committed by Mauro Carvalho Chehab
parent ff51762f8b
commit 97913bcbe6
1 changed files with 7 additions and 7 deletions
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14
drivers/media/platform/exynos4-is/fimc-isp.c
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@ -366,16 +366,16 @@ static int fimc_isp_subdev_s_power(struct v4l2_subdev *sd, int on)
static int fimc_isp_subdev_open(struct v4l2_subdev *sd,
struct v4l2_subdev_fh *fh)
{
struct v4l2_mbus_framefmt fmt;
struct v4l2_mbus_framefmt *format;
struct v4l2_mbus_framefmt fmt = {
.colorspace = V4L2_COLORSPACE_SRGB,
.code = fimc_isp_formats[0].mbus_code,
.width = DEFAULT_PREVIEW_STILL_WIDTH + FIMC_ISP_CAC_MARGIN_WIDTH,
.height = DEFAULT_PREVIEW_STILL_HEIGHT + FIMC_ISP_CAC_MARGIN_HEIGHT,
.field = V4L2_FIELD_NONE,
};
format = v4l2_subdev_get_try_format(sd, fh->pad, FIMC_ISP_SD_PAD_SINK);
fmt.colorspace = V4L2_COLORSPACE_SRGB;
fmt.code = fimc_isp_formats[0].mbus_code;
fmt.width = DEFAULT_PREVIEW_STILL_WIDTH + FIMC_ISP_CAC_MARGIN_WIDTH;
fmt.height = DEFAULT_PREVIEW_STILL_HEIGHT + FIMC_ISP_CAC_MARGIN_HEIGHT;
fmt.field = V4L2_FIELD_NONE;
*format = fmt;
format = v4l2_subdev_get_try_format(sd, fh->pad, FIMC_ISP_SD_PAD_SRC_FIFO);