[FFmpeg-cvslog] avcodec/mpeg12dec: Use 64bit in bit computation

[Michael Niedermayer]

ffmpeg | branch: release/5.1 | Michael Niedermayer <michael at niedermayer.cc> | Sat May 11 21:04:00 2024 +0200| [701ca03b0063a09e9fe5d536dbe55bc9282dad41] | committer: Michael Niedermayer

avcodec/mpeg12dec: Use 64bit in bit computation

I dont think this can actually overflow but 64bit seems reasonable to use

Fixes: CID1521983 Unintentional integer overflow

Sponsored-by: Sovereign Tech Fund
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 4c725df059dd9a5f2071e204924105b3ceb74cbc)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=701ca03b0063a09e9fe5d536dbe55bc9282dad41
---

 libavcodec/mpeg12dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 0e8627c4a4..57ee5eaac1 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -2979,7 +2979,7 @@ static int ipu_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     int ret;
 
     // Check for minimal intra MB size (considering mb header, luma & chroma dc VLC, ac EOB VLC)
-    if (avpkt->size*8LL < (avctx->width+15)/16 * ((avctx->height+15)/16) * (2 + 3*4 + 2*2 + 2*6))
+    if (avpkt->size*8LL < (avctx->width+15)/16 * ((avctx->height+15)/16) * (2LL + 3*4 + 2*2 + 2*6))
         return AVERROR_INVALIDDATA;
 
     ret = ff_get_buffer(avctx, frame, 0);