[FFmpeg-cvslog] avformat/apm: Use 64bit for bit_rate computation

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 17 21:24:49 2022 +0200| [5b23cab5c769d6611a3fe111546d65809046a4d8] | committer: Michael Niedermayer

avformat/apm: Use 64bit for bit_rate computation

Fixes: signed integer overflow: -1155522528 * 4 cannot be represented in type 'int'
Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_APM_fuzzer-6580670570299392

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=5b23cab5c769d6611a3fe111546d65809046a4d8
---

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

diff --git a/libavformat/apm.c b/libavformat/apm.c
index baf7d2f941..a3ddc08e83 100644
--- a/libavformat/apm.c
+++ b/libavformat/apm.c
@@ -148,7 +148,7 @@ static int apm_read_header(AVFormatContext *s)
     par->codec_id              = AV_CODEC_ID_ADPCM_IMA_APM;
     par->format                = AV_SAMPLE_FMT_S16;
     par->bit_rate              = par->ch_layout.nb_channels *
-                                 par->sample_rate *
+                                 (int64_t)par->sample_rate *
                                  par->bits_per_coded_sample;
 
     if ((ret = avio_read(s->pb, buf, APM_FILE_EXTRADATA_SIZE)) < 0)