[FFmpeg-cvslog] avformat/wavdec: Use 64bit in new_pos computation
Michael Niedermayer
git at videolan.org
Sat Jul 31 23:56:15 EEST 2021
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Apr 27 20:57:02 2021 +0200| [9b57d2f0a967195dc1c72fda8f3a983a0132a243] | committer: Michael Niedermayer
avformat/wavdec: Use 64bit in new_pos computation
Fixes: signed integer overflow: 129 * 16711680 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_WAV_fuzzer-6742285317439488
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=9b57d2f0a967195dc1c72fda8f3a983a0132a243
---
libavformat/wavdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/wavdec.c b/libavformat/wavdec.c
index d2fb81ca7f..5992ef4bcf 100644
--- a/libavformat/wavdec.c
+++ b/libavformat/wavdec.c
@@ -718,7 +718,7 @@ smv_retry:
if (wav->smv_last_stream) {
uint64_t old_pos = avio_tell(s->pb);
uint64_t new_pos = wav->smv_data_ofs +
- wav->smv_block * wav->smv_block_size;
+ wav->smv_block * (int64_t)wav->smv_block_size;
if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
ret = AVERROR_EOF;
goto smv_out;
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