[FFmpeg-cvslog] avformat/pp_bnk: Use 64bit in bitrate computation

[Michael Niedermayer]

ffmpeg | branch: release/4.4 | Michael Niedermayer <michael at niedermayer.cc> | Sun Apr 25 20:12:13 2021 +0200| [b425df191cc3c4a764f69b6455b5dbf4a9277cf7] | committer: Michael Niedermayer

avformat/pp_bnk: Use 64bit in bitrate computation

Fixes: signed integer overflow: 1207959552 * 4 cannot be represented in type 'int'
Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_PP_BNK_fuzzer-6747301169201152

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 88fc295838b3cf16b43c0bbea5766fe92b18dd17)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b425df191cc3c4a764f69b6455b5dbf4a9277cf7
---

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

diff --git a/libavformat/pp_bnk.c b/libavformat/pp_bnk.c
index 07eeca3cd5..5ffe733b18 100644
--- a/libavformat/pp_bnk.c
+++ b/libavformat/pp_bnk.c
@@ -223,7 +223,7 @@ static int pp_bnk_read_header(AVFormatContext *s)
         par->bits_per_coded_sample  = 4;
         par->bits_per_raw_sample    = 16;
         par->block_align            = 1;
-        par->bit_rate               = par->sample_rate * par->bits_per_coded_sample * par->channels;
+        par->bit_rate               = par->sample_rate * (int64_t)par->bits_per_coded_sample * par->channels;
 
         avpriv_set_pts_info(st, 64, 1, par->sample_rate);
         st->start_time              = 0;