From 56e76bd0579cc7f7b28860885d9e569a39daf41b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 15 May 2018 17:06:59 +0200 Subject: [PATCH] avformat/mov: Break out early if chunk_count is 0 in mov_build_index() 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 --- libavformat/mov.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavformat/mov.c b/libavformat/mov.c index 1975011741..4848a106f2 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -3900,6 +3900,9 @@ static void mov_build_index(MOVContext *mov, AVStream *st) } else { unsigned chunk_samples, total = 0; + if (!sc->chunk_count) + return; + // compute total chunk count for (i = 0; i < sc->stsc_count; i++) { unsigned count, chunk_count;