avformat/aaxdec: Check for overlaping segments

Fixes: Timeout
Fixes: 45875/clusterfuzz-testcase-minimized-ffmpeg_dem_AAX_fuzzer-6121689903136768

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/aaxdec.c

@@ -252,6 +252,10 @@ static int aax_read_header(AVFormatContext *s)
                 size  = avio_rb32(pb);
                 a->segments[r].start = start + a->data_offset;
                 a->segments[r].end   = a->segments[r].start + size;
+                if (r &&
+                    a->segments[r].start < a->segments[r-1].end &&
+                    a->segments[r].end   > a->segments[r-1].start)
+                    return AVERROR_INVALIDDATA;
             } else
                 return AVERROR_INVALIDDATA;
         }