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[FFmpeg-devel,2/2] avformat/asfdec_f: Change order or operations slightly

Message ID 20200912181855.29304-2-michael@niedermayer.cc
State New
Headers show
Series [FFmpeg-devel,1/2] avcodec/arbc: Assume that at least one segment has a tile
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andriy/default pending
andriy/make success Make finished
andriy/make_fate success Make fate finished

Commit Message

Michael Niedermayer Sept. 12, 2020, 6:18 p.m. UTC
Fixes: signed integer overflow: 20 * 5184056935931942919 cannot be represented in type 'long'
Fixes: 25466/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4798660247552000

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

diff --git a/libavformat/asfdec_f.c b/libavformat/asfdec_f.c
index e9ddca7151..103155e9e7 100644
--- a/libavformat/asfdec_f.c
+++ b/libavformat/asfdec_f.c
@@ -424,7 +424,7 @@  static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
     if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
         int64_t fsize = avio_size(pb);
         if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
-            20*FFABS(fsize - (int64_t)asf->hdr.file_size) < FFMIN(fsize, asf->hdr.file_size))
+            FFABS(fsize - (int64_t)asf->hdr.file_size) < FFMIN(fsize, asf->hdr.file_size)/20)
             st->duration = asf->hdr.play_time /
                        (10000000 / 1000) - start_time;
     }