[FFmpeg-devel] [PATCH 1/7] avformat/sbgdec: Check that end is not before start
Michael Niedermayer
michael at niedermayer.cc
Tue Nov 10 01:04:50 EET 2020
Fixes: signed integer overflow: -9223372036854775808 + -5279949906739200 cannot be represented in type 'long'
Fixes: 26908/clusterfuzz-testcase-minimized-ffmpeg_dem_SBG_fuzzer-6329610851319808
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/sbgdec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavformat/sbgdec.c b/libavformat/sbgdec.c
index 4d6ae7abc5..f56eb9ff59 100644
--- a/libavformat/sbgdec.c
+++ b/libavformat/sbgdec.c
@@ -1416,6 +1416,11 @@ static av_cold int sbg_read_header(AVFormatContext *avf)
if (r < 0)
goto fail;
+ if (script.end_ts != AV_NOPTS_VALUE && script.end_ts < script.start_ts) {
+ r = AVERROR_INVALIDDATA;
+ goto fail;
+ }
+
st = avformat_new_stream(avf, NULL);
if (!st)
return AVERROR(ENOMEM);
--
2.17.1
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