[FFmpeg-cvslog] avformat/rpl: Check for number_of_chunks overflow
Michael Niedermayer
git at videolan.org
Sun Apr 14 23:58:31 EEST 2024
ffmpeg | branch: release/3.4 | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 30 21:14:28 2023 +0200| [1fb07380539402936ab5ccce64763f4279d720cc] | committer: Michael Niedermayer
avformat/rpl: Check for number_of_chunks overflow
Fixes: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int32_t' (aka 'int')
Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_RPL_fuzzer-6086131095830528
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit b3c973acbecb879d4949fecdadd2fdfc08dea42b)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1fb07380539402936ab5ccce64763f4279d720cc
---
libavformat/rpl.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/libavformat/rpl.c b/libavformat/rpl.c
index ad3800a906..64a711a548 100644
--- a/libavformat/rpl.c
+++ b/libavformat/rpl.c
@@ -242,6 +242,9 @@ static int rpl_read_header(AVFormatContext *s)
"Video stream will be broken!\n", av_fourcc2str(vst->codecpar->codec_tag));
number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
+ if (number_of_chunks == INT_MAX)
+ return AVERROR_INVALIDDATA;
+
// The number in the header is actually the index of the last chunk.
number_of_chunks++;
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