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lavc/cbs_h2645: Fix incorrect max size of nalu unit 

In the worst case the startcode prefix has 4 bytes.

This fixes a trigerred assertion:
Assertion dp <= max_size failed at libavcodec/cbs_h2645.c:1451

Found-by:libFuzzer
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Andriy Gelman <andriy.gelman@gmail.com>
This commit is contained in:
Andriy Gelman 2019-12-06 11:03:02 -05:00 committed by James Almer
parent 79d907774d
commit 02a83e26de
1 changed files with 1 additions and 1 deletions
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libavcodec/cbs_h2645.c
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@ -1395,7 +1395,7 @@ static int cbs_h2645_assemble_fragment(CodedBitstreamContext *ctx,
max_size = 0;
for (i = 0; i < frag->nb_units; i++) {
// Start code + content with worst-case emulation prevention.
max_size += 3 + frag->units[i].data_size * 3 / 2;
max_size += 4 + frag->units[i].data_size * 3 / 2;
}
data = av_realloc(NULL, max_size + AV_INPUT_BUFFER_PADDING_SIZE);