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media: videodev2.h: Fix shifting signed 32-bit value by 31 bits problem

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Fix v4l2_fourcc define to use "U" cast to avoid shifting signed 32-bit
value by 31 bits problem. This isn't a problem for kernel builds with
gcc.

This could be problem since this header is part of public API which
could be included for builds using compilers that don't handle this
condition safely resulting in undefined behavior.

Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Shuah Khan 2019-06-12 20:56:52 -04:00 committed by Mauro Carvalho Chehab
parent 5ca004d11b
commit ff3c65cb81
1 changed files with 1 additions and 1 deletions
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2
include/uapi/linux/videodev2.h
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@ -80,7 +80,7 @@
/* Four-character-code (FOURCC) */
#define v4l2_fourcc(a, b, c, d)\
((__u32)(a) | ((__u32)(b) << 8) | ((__u32)(c) << 16) | ((__u32)(d) << 24))
#define v4l2_fourcc_be(a, b, c, d) (v4l2_fourcc(a, b, c, d) | (1 << 31))
#define v4l2_fourcc_be(a, b, c, d) (v4l2_fourcc(a, b, c, d) | (1U << 31))
/*
* E N U M S