Fixes: Timeout
Fixes: 
29766/clusterfuzz-testcase-minimized-ffmpeg_dem_AAX_fuzzer-5635887566290944

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/aaxdec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/aaxdec.c b/libavformat/aaxdec.c
index 7d10e805ca..c6d2d1c8d1 100644
--- a/libavformat/aaxdec.c
+++ b/libavformat/aaxdec.c
@@ -264,6 +264,11 @@ static int aax_read_header(AVFormatContext *s)
         }
     }
 
+    if (!a->segments[0].end) {
+        ret = AVERROR_INVALIDDATA;
+        goto fail;
+    }
+
     st = avformat_new_stream(s, NULL);
     if (!st) {
         ret = AVERROR(ENOMEM);
-- 
2.17.1

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