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avcodec/g2meet: Check tile_width in epic_jb_decode_tile() 

Fixes: out of array access
Fixes: 21469/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G2M_fuzzer-5199357982015488

Alternatively the arrays can be made bigger or the index can be clipped.
In case a real file with such huge tiles exist we ask the user to upload it.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 5501bb28dd)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-04-05 22:58:29 +02:00
parent c8a7672299
commit 65ae8c5a31
1 changed files with 5 additions and 0 deletions
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libavcodec/g2meet.c
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@ -917,6 +917,11 @@ static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
awidth = FFALIGN(tile_width, 16);
aheight = FFALIGN(tile_height, 16);
if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
avpriv_request_sample(avctx, "large tile width");
return AVERROR_INVALIDDATA;
}
if (els_dsize) {
int ret, i, j, k;
uint8_t tr_r, tr_g, tr_b, *buf;