Re: [FFmpeg-devel] [PATCH 2/2] swscale/input: Use more unsigned intermediates

[Michael Niedermayer <michael@niedermayer.cc>]

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On Tue, Nov 15, 2022 at 11:16:57PM +0100, Michael Niedermayer wrote:
> Same principle as previous commit, with sufficiently huge rgb2yuv table
> values this produces wrong results and undefined behavior.
> The unsigned produces the same incorrect results. That is probably
> ok as these cases with huge values seem not to occur in any real
> use case.
> 
> There are more cases but someone is refactoring them, so i didnt yet change
> them.
> 
> Fixes: signed integer overflow
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libswscale/input.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)

will apply patch set

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Awnsering whenever a program halts or runs forever is
On a turing machine, in general impossible (turings halting problem).
On any real computer, always possible as a real computer has a finite number
of states N, and will either halt in less than N cycles or never halt.

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