Fixes: Assertion failure and memleak
Fixes: 
15709/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_APE_fuzzer-5182435093905408

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 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/apedec.c b/libavcodec/apedec.c
index e9ffdfdcdf..8872185b84 100644
--- a/libavcodec/apedec.c
+++ b/libavcodec/apedec.c
@@ -1451,7 +1451,8 @@ static int ape_decode_frame(AVCodecContext *avctx, void 
*data,
         if (s->fileversion >= 3900) {
             if (offset > 3) {
                 av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
-                s->data = NULL;
+                av_freep(&s->data);
+                s->data_size = 0;
                 return AVERROR_INVALIDDATA;
             }
             if (s->data_end - s->ptr < offset) {
-- 
2.22.0

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