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avcodec/huffyuvdec: Test vertical coordinate more often 

Fixes: out of array access
Fixes: 22892/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HYMT_fuzzer-5135996772679680.fuzz

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-06-05 22:05:27 +02:00
parent d9aa1ef2c2
commit a1223ddc56
1 changed files with 8 additions and 0 deletions
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8
libavcodec/huffyuvdec.c
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@ -928,12 +928,16 @@ static int decode_slice(AVCodecContext *avctx, AVFrame *p, int height,
left= left_prediction(s, p->data[plane], s->temp[0], w, 0); left= left_prediction(s, p->data[plane], s->temp[0], w, 0);
y = 1; y = 1;
if (y >= h)
break;
/* second line is left predicted for interlaced case */ /* second line is left predicted for interlaced case */
if (s->interlaced) { if (s->interlaced) {
decode_plane_bitstream(s, w, plane); decode_plane_bitstream(s, w, plane);
left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left); left = left_prediction(s, p->data[plane] + p->linesize[plane], s->temp[0], w, left);
y++; y++;
if (y >= h)
break;
} }
lefttop = p->data[plane][0]; lefttop = p->data[plane][0];
@ -1045,6 +1049,8 @@ static int decode_slice(AVCodecContext *avctx, AVFrame *p, int height,
} }
cy = y = 1; cy = y = 1;
if (y >= height)
break;
/* second line is left predicted for interlaced case */ /* second line is left predicted for interlaced case */
if (s->interlaced) { if (s->interlaced) {
@ -1057,6 +1063,8 @@ static int decode_slice(AVCodecContext *avctx, AVFrame *p, int height,
} }
y++; y++;
cy++; cy++;
if (y >= height)
break;
} }
/* next 4 pixels are left predicted too */ /* next 4 pixels are left predicted too */