Re: [FFmpeg-devel] [PATCH] avcodec/texturedspenc: Fix indexing in color distribution determination

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH] avcodec/texturedspenc: Fix indexing in color distribution determination
Date: Tue, 24 May 2022 01:24:42 +0200
Message-ID: <20220523232442.GW396728@pb2> (raw)
In-Reply-To: <CABLWnS-W57zTdLMHwZC78d9un2F1e57GHEG7vj0Kqc6xoz7Yyw@mail.gmail.com>

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On Wed, Jan 04, 2017 at 11:52:50PM +0100, Vittorio Giovara wrote:
> On Wed, Jan 4, 2017 at 1:06 AM, Michael Niedermayer
> <michael@niedermayer.cc> wrote:
> > On Tue, Jan 03, 2017 at 02:15:20PM +0100, Vittorio Giovara wrote:
> >> On Mon, Jan 2, 2017 at 2:00 AM, James Almer <jamrial@gmail.com> wrote:
> >> > On 1/1/2017 8:28 PM, Michael Niedermayer wrote:
> >> >> Fixes CID1396405
> >>
> >> What is the CID about?
> >
> > sorry for not quoting this prviously, it isnt very interresting.
> > my patch is based on just this and guesswork, which is why it should
> > be tested.
> >
> > 257        for (y = 0; y < 4; y++) {
> >    assignment: Assigning: x = 4.
> >    const: At condition x < 4, the value of x must be equal to 4.
> >    dead_error_condition: The condition x < 4 cannot be true.
> > 258            for (x = 4; x < 4; x += 4) {
> >    CID 1396405 (#1 of 1): Logically dead code (DEADCODE)dead_error_begin: Execution cannot reach this statement: muv += bp[x * 4 + y * stride];.
> 
> Ah, yes that seems wrong, probably a leftover of the code conversion
> (from https://github.com/nothings/stb/blob/master/stb_dxt.h#L293-L298)
> I believe it should be sufficient to do `for (x = 0; x < 4; x++)` but
> I won't be able to test that for a while I'm afraid

This issue seems stil open, i just stumbled accross the CID again
when looking at coverity
anyone has means to test this ?

thx

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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