[FFmpeg-cvslog] avcodec/mpegvideo_dec: Use av_fast_padded_malloc where appropriate

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Mon Jul 31 12:08:49 2023 +0200| [27a9e1ce2262f42b900e09f872f4b98e209b8842] | committer: Andreas Rheinhardt

avcodec/mpegvideo_dec: Use av_fast_padded_malloc where appropriate

Will probably also fix Coverity issue #1473529.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=27a9e1ce2262f42b900e09f872f4b98e209b8842
---

 libavcodec/mpegvideo_dec.c | 17 ++++++-----------
 1 file changed, 6 insertions(+), 11 deletions(-)

diff --git a/libavcodec/mpegvideo_dec.c b/libavcodec/mpegvideo_dec.c
index 670b0912e2..16e8b9193a 100644
--- a/libavcodec/mpegvideo_dec.c
+++ b/libavcodec/mpegvideo_dec.c
@@ -154,21 +154,16 @@ do {\
     s->divx_packed  = s1->divx_packed;
 
     if (s1->bitstream_buffer) {
-        if (s1->bitstream_buffer_size +
-            AV_INPUT_BUFFER_PADDING_SIZE > s->allocated_bitstream_buffer_size) {
-            av_fast_malloc(&s->bitstream_buffer,
-                           &s->allocated_bitstream_buffer_size,
-                           s1->allocated_bitstream_buffer_size);
-            if (!s->bitstream_buffer) {
-                s->bitstream_buffer_size = 0;
-                return AVERROR(ENOMEM);
-            }
+        av_fast_padded_malloc(&s->bitstream_buffer,
+                              &s->allocated_bitstream_buffer_size,
+                              s1->bitstream_buffer_size);
+        if (!s->bitstream_buffer) {
+            s->bitstream_buffer_size = 0;
+            return AVERROR(ENOMEM);
         }
         s->bitstream_buffer_size = s1->bitstream_buffer_size;
         memcpy(s->bitstream_buffer, s1->bitstream_buffer,
                s1->bitstream_buffer_size);
-        memset(s->bitstream_buffer + s->bitstream_buffer_size, 0,
-               AV_INPUT_BUFFER_PADDING_SIZE);
     }
 
     // linesize-dependent scratch buffer allocation