[FFmpeg-devel] [PATCH 1/4] avformat/iff: Check size before skip
Michael Niedermayer
michael at niedermayer.cc
Sun Nov 15 00:26:25 EET 2020
Fixes: Infinite loop
Fixes: 27292/clusterfuzz-testcase-minimized-ffmpeg_dem_IFF_fuzzer-5731168991051776
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/iff.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/iff.c b/libavformat/iff.c
index a70184f105..f017684620 100644
--- a/libavformat/iff.c
+++ b/libavformat/iff.c
@@ -259,6 +259,9 @@ static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
uint64_t size = avio_rb64(pb);
uint64_t orig_pos = avio_tell(pb);
+ if (size >= INT64_MAX)
+ return AVERROR_INVALIDDATA;
+
switch(tag) {
case MKTAG('A','B','S','S'):
if (size < 8)
--
2.17.1
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