[FFmpeg-cvslog] avformat/aaxdec: Check for overlaping segments

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed Mar 23 00:57:34 2022 +0100| [c16a0ed2422a86e0f3286f59281d119c4d8d159a] | committer: Michael Niedermayer

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 at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c16a0ed2422a86e0f3286f59281d119c4d8d159a
---

 libavformat/aaxdec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/aaxdec.c b/libavformat/aaxdec.c
index e47ab3ad73..dd1fbde736 100644
--- a/libavformat/aaxdec.c
+++ b/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;
         }