[FFmpeg-cvslog] avformat/asfdec_f: Check sizeX against padding

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Apr 23 17:35:20 2021 +0200| [f034c2e36acb7d0c11dc1849ddf8a67bde44eff4] | committer: Michael Niedermayer

avformat/asfdec_f: Check sizeX against padding

Fixes: signed integer overflow: 2147483607 + 64 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_fuzzer-6753897878257664

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=f034c2e36acb7d0c11dc1849ddf8a67bde44eff4
---

 libavformat/asfdec_f.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/asfdec_f.c b/libavformat/asfdec_f.c
index 053c815977..ff6ddfb967 100644
--- a/libavformat/asfdec_f.c
+++ b/libavformat/asfdec_f.c
@@ -415,7 +415,7 @@ static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
         tag1                             = avio_rl32(pb);
         avio_skip(pb, 20);
         if (sizeX > 40) {
-            if (size < sizeX - 40)
+            if (size < sizeX - 40 || sizeX - 40 > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
                 return AVERROR_INVALIDDATA;
             st->codecpar->extradata_size = ffio_limit(pb, sizeX - 40);
             st->codecpar->extradata      = av_mallocz(st->codecpar->extradata_size +