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avcodec/tiff: Remove messing with jpeg context 

The whole concept is just not correct, also as it seems not to be needed
at all, all dng files i have decode without this.

Fixes: various crashes
Fixes: 42937/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4625073334517760
Fixes: 42938/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4643368217477120
Fixes: 42939/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4925325908246528
Fixes: 42940/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-4925378806808576
Fixes: 42941/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6202009265504256
Fixes: 42944/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-6076860998483968

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 2021-12-25 20:14:48 +01:00
parent 65197e9c98
commit afdbc940c6
1 changed files with 2 additions and 22 deletions
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24
libavcodec/tiff.c
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@ -721,20 +721,6 @@ static int dng_decode_jpeg(AVCodecContext *avctx, AVFrame *frame,
return 0;
}
static int dng_decode_strip(AVCodecContext *avctx, AVFrame *frame)
{
TiffContext *s = avctx->priv_data;
int ret = ff_set_dimensions(s->avctx_mjpeg, s->width, s->height);
if (ret < 0)
return ret;
s->jpgframe->width = s->width;
s->jpgframe->height = s->height;
return dng_decode_jpeg(avctx, frame, s->stripsize, 0, 0, s->width, s->height);
}
static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
const uint8_t *src, int size, int strip_start, int lines)
{
@ -856,7 +842,7 @@ static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int strid
av_log(s->avctx, AV_LOG_ERROR, "More than one DNG JPEG strips unsupported\n");
return AVERROR_PATCHWELCOME;
}
if ((ret = dng_decode_strip(s->avctx, p)) < 0)
if ((ret = dng_decode_jpeg(s->avctx, p, s->stripsize, 0, 0, s->width, s->height)) < 0)
return ret;
return 0;
}
@ -972,13 +958,7 @@ static int dng_decode_tiles(AVCodecContext *avctx, AVFrame *frame,
int has_width_leftover, has_height_leftover;
int tile_x = 0, tile_y = 0;
int pos_x = 0, pos_y = 0;
int ret = ff_set_dimensions(s->avctx_mjpeg, s->tile_width, s->tile_length);
if (ret < 0)
return ret;
s->jpgframe->width = s->tile_width;
s->jpgframe->height = s->tile_length;
int ret;
has_width_leftover = (s->width % s->tile_width != 0);
has_height_leftover = (s->height % s->tile_length != 0);