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Code Issues Releases Activity

avcodec/mobiclip: Rewrite code to make it clearer

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In order to know that the earlier code did not use uninitialized
values one needs to know that the lowest four bits of each used
value of pframe_block4x4_coefficients_tab do not vanish identically.
E.g. Coverity did not get this and warned about it in ticket #1466632.
Fix this by slightly rewriting the code.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-11-18 08:22:38 +01:00
parent f5e74e8d48
commit d6c16c5217
1 changed files with 3 additions and 4 deletions
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7
libavcodec/mobiclip.c
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@ -491,7 +491,7 @@ static int add_pframe_coefficients(AVCodecContext *avctx, AVFrame *frame,
int ret, idx = get_ue_golomb_31(gb);
if (idx == 0) {
ret = add_coefficients(avctx, frame, bx, by, size, plane);
return add_coefficients(avctx, frame, bx, by, size, plane);
} else if ((unsigned)idx < FF_ARRAY_ELEMS(pframe_block4x4_coefficients_tab)) {
int flags = pframe_block4x4_coefficients_tab[idx];
@ -505,11 +505,10 @@ static int add_pframe_coefficients(AVCodecContext *avctx, AVFrame *frame,
flags >>= 1;
}
}
return 0;
} else {
ret = AVERROR_INVALIDDATA;
return AVERROR_INVALIDDATA;
}
return ret;
}
static int adjust(int x, int size)