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avcodec/mjpegdec: Check for unsupported bayer case 

Fixes: out of array access
Fixes: 51462/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-662559341582745

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 2022-09-18 23:42:02 +02:00
parent 8306074dc6
commit dd81cc22b3
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GPG Key ID: B18E8928B3948D64
1 changed files with 2 additions and 0 deletions
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libavcodec/mjpegdec.c
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@ -1212,6 +1212,8 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int nb_components, int p
ptr[3*mb_x + 2] = buffer[mb_x][2] + ptr[3*mb_x + 1];
}
} else if (s->bayer) {
if (s->bits <= 8)
return AVERROR_PATCHWELCOME;
if (nb_components == 1) {
/* Leave decoding to the TIFF/DNG decoder (see comment in ff_mjpeg_decode_sof) */
for (mb_x = 0; mb_x < width; mb_x++)