[FFmpeg-cvslog] avformat/swfenc: Fix integer overflow in frame rate handling

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Sun Feb 16 18:32:31 2020 +0100| [52510a50f7537917cd0880f10f0db407e56e0215] | committer: Michael Niedermayer

avformat/swfenc: Fix integer overflow in frame rate handling

Fixes: signed integer overflow: 30000299 * 256 cannot be represented in type 'int'
Fixes: ticket8184

Found-by: Suhwan
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 31f956acadd994b8c4e22b714aaffee0f527c827)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=52510a50f7537917cd0880f10f0db407e56e0215
---

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

diff --git a/libavformat/swfenc.c b/libavformat/swfenc.c
index f53db0fb2b..877dcfa9cb 100644
--- a/libavformat/swfenc.c
+++ b/libavformat/swfenc.c
@@ -256,7 +256,7 @@ static int swf_write_header(AVFormatContext *s)
         av_log(s, AV_LOG_ERROR, "Invalid (too large) frame rate %d/%d\n", rate, rate_base);
         return AVERROR(EINVAL);
     }
-    avio_wl16(pb, (rate * 256) / rate_base); /* frame rate */
+    avio_wl16(pb, (rate * 256LL) / rate_base); /* frame rate */
     swf->duration_pos = avio_tell(pb);
     avio_wl16(pb, (uint16_t)(DUMMY_DURATION * (int64_t)rate / rate_base)); /* frame count */