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avcodec/tiff: Check frame parameters before blit for DNG 

Fixes: out of array access
Fixes: 23888/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6021365974171648.fuzz

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 2020-07-04 14:17:05 +02:00
parent 865a34970e
commit 4091f4f780
1 changed files with 13 additions and 2 deletions
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15
libavcodec/tiff.c
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@ -911,12 +911,23 @@ static int dng_decode_jpeg(AVCodecContext *avctx, AVFrame *frame,
return 0;
}
is_u16 = (s->bpp > 8);
/* Copy the outputted tile's pixels from 'jpgframe' to 'frame' (final buffer) */
/* See dng_blit for explanation */
is_single_comp = (s->avctx_mjpeg->width == w * 2 && s->avctx_mjpeg->height == h / 2);
if (s->avctx_mjpeg->width == w * 2 &&
s->avctx_mjpeg->height == h / 2 &&
s->avctx_mjpeg->pix_fmt == AV_PIX_FMT_GRAY16LE) {
is_single_comp = 1;
} else if (s->avctx_mjpeg->width == w &&
s->avctx_mjpeg->height == h &&
s->avctx_mjpeg->pix_fmt == (is_u16 ? AV_PIX_FMT_GRAY16 : AV_PIX_FMT_GRAY8)
) {
is_single_comp = 0;
} else
return AVERROR_INVALIDDATA;
is_u16 = (s->bpp > 8);
pixel_size = (is_u16 ? sizeof(uint16_t) : sizeof(uint8_t));
if (is_single_comp && !is_u16) {