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avformat/mov: Break out early if chunk_count is 0 in mov_build_index()

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Without this some operations might overflow (undefined behavior)
even though the index adding loop would never execute

No testcase known

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2018-05-15 17:06:59 +02:00
parent fac5849915
commit 56e76bd057
1 changed files with 3 additions and 0 deletions
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3
libavformat/mov.c
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@@ -3900,6 +3900,9 @@ static void mov_build_index(MOVContext *mov, AVStream *st)
} else { } else {
unsigned chunk_samples, total = 0; unsigned chunk_samples, total = 0;
if (!sc->chunk_count)
return;
// compute total chunk count // compute total chunk count
for (i = 0; i < sc->stsc_count; i++) { for (i = 0; i < sc->stsc_count; i++) {
unsigned count, chunk_count; unsigned count, chunk_count;