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avcodec/jpeg2000dec: jpeg2000 has its own lowres option

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jpeg2000 overrides the global lowres variable with a lowres field called reduction_factor
ffmpeg -lowres X causes the reduction_factor to be set
ffplay -lowres X causes both lowres and the reduction_factor to be set
ossfuss sets only lowres

only the ffmpeg variant works. This patch tries to make the other 2 work.

Alternative we could just error out if things are inconsistent.
More complex restructuring should be limited to the master branch
to keep this reasonably easy to backport

Fixes: out of array access
Fixes: 59672/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-06-10 01:11:48 +02:00
parent 90647a9249
commit c012d1f2bb
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1 changed files with 9 additions and 1 deletions
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10
libavcodec/jpeg2000dec.c
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@ -308,7 +308,7 @@ static int get_siz(Jpeg2000DecoderContext *s)
dimy = FFMAX(dimy, ff_jpeg2000_ceildiv(o_dimy, s->cdy[i]));
}
ret = ff_set_dimensions(s->avctx, dimx, dimy);
ret = ff_set_dimensions(s->avctx, dimx << s->avctx->lowres, dimy << s->avctx->lowres);
if (ret < 0)
return ret;
@ -2426,6 +2426,14 @@ static av_cold int jpeg2000_decode_init(AVCodecContext *avctx)
{
Jpeg2000DecoderContext *s = avctx->priv_data;
if (avctx->lowres)
av_log(avctx, AV_LOG_WARNING, "lowres is overriden by reduction_factor but set anyway\n");
if (!s->reduction_factor && avctx->lowres < JPEG2000_MAX_RESLEVELS) {
s->reduction_factor = avctx->lowres;
}
if (avctx->lowres != s->reduction_factor && avctx->lowres)
return AVERROR(EINVAL);
ff_jpeg2000dsp_init(&s->dsp);
ff_jpeg2000_init_tier1_luts();