[FFmpeg-devel] [PATCH 1/9] avformat/ape: Check frames size

[Michael Niedermayer]

Fixes: signed integer overflow: 9223372036854775806 + 3 cannot be represented in type 'long'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_APE_fuzzer-6389264140599296

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavformat/ape.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/ape.c b/libavformat/ape.c
index f904fde178c..92e9ac7cb1c 100644
--- a/libavformat/ape.c
+++ b/libavformat/ape.c
@@ -298,6 +298,8 @@ static int ape_read_header(AVFormatContext * s)
             ape->frames[i].pos  -= ape->frames[i].skip;
             ape->frames[i].size += ape->frames[i].skip;
         }
+        if (ape->frames[i].size > INT_MAX - 3)
+            return AVERROR_INVALIDDATA;
         ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
     }
     if (ape->fileversion < 3810) {
-- 
2.17.1