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avcodec/tiff: Check tile_length and tile_width

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Fixes: Division by 0
Fixes: 49235/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_TIFF_fuzzer-5495613847896064

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 76112c2b4167bb3c40503b3334c8b38fd707a8d5)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-07-21 23:27:59 +02:00
parent ff6d408ac0
commit cd76f3ed59
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1 changed files with 3 additions and 0 deletions
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libavcodec/tiff.c
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@ -977,6 +977,9 @@ static int dng_decode_tiles(AVCodecContext *avctx, AVFrame *frame,
int pos_x = 0, pos_y = 0; int pos_x = 0, pos_y = 0;
int ret; int ret;
if (s->tile_width <= 0 || s->tile_length <= 0)
return AVERROR_INVALIDDATA;
has_width_leftover = (s->width % s->tile_width != 0); has_width_leftover = (s->width % s->tile_width != 0);
has_height_leftover = (s->height % s->tile_length != 0); has_height_leftover = (s->height % s->tile_length != 0);