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avcodec/dnxhd_parser: Fix parser when input does not have nicely sized packets

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Fixes: out of array access
Fixes: 15522/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DNXHD_fuzzer-5747756078989312

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 2d900d8fe0aaf9c984e024956eb537ecdfe2c949)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-07-06 11:51:09 +02:00
parent 01f9c1540a
commit cacf998071
1 changed files with 2 additions and 1 deletions
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3
libavcodec/dnxhd_parser.c
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@ -79,8 +79,9 @@ static int dnxhd_find_frame_end(DNXHDParserContext *dctx,
if (remaining <= 0)
continue;
}
remaining += i - 47;
dctx->remaining = remaining;
if (buf_size - i + 47 >= dctx->remaining) {
if (buf_size >= dctx->remaining) {
pc->frame_start_found = 0;
pc->state64 = -1;
dctx->cur_byte = 0;