Fixes: Integer overflow
Fixes: 
40973/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-6739312704618496

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/apedec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index 9c723f29977..5c3261cf5cb 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1337,7 +1337,7 @@ static void do_apply_filter(APEContext *ctx, int version, 
APEFilter *f,
             absres = FFABSU(res);
             if (absres)
                 *f->adaptcoeffs = APESIGN(res) *
-                                  (8 << ((absres > f->avg * 3LL) + (absres > 
(f->avg + f->avg / 3))));
+                                  (8 << ((absres > f->avg * 3LL) + (absres > 
((int64_t)f->avg + f->avg / 3))));
                 /* equivalent to the following code
                     if (absres <= f->avg * 4 / 3)
                         *f->adaptcoeffs = APESIGN(res) * 8;
-- 
2.17.1

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