Merge commit '91ac403b'

* commit '91ac403b':
  lavf: fix arithmetic overflows in avformat_seek_file()
  mjpeg: initialize input padding after unescaped buffer to zero

Conflicts:
	libavformat/utils.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/mjpegdec.c

@@ -1557,6 +1557,8 @@ int ff_mjpeg_find_marker(MJpegDecodeContext *s,
         }
         *unescaped_buf_ptr  = s->buffer;
         *unescaped_buf_size = dst - s->buffer;
+        memset(s->buffer + *unescaped_buf_size, 0,
+               FF_INPUT_BUFFER_PADDING_SIZE);
 
         av_log(s->avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
                (buf_end - *buf_ptr) - (dst - s->buffer));
@@ -1598,6 +1600,8 @@ int ff_mjpeg_find_marker(MJpegDecodeContext *s,
 
         *unescaped_buf_ptr  = dst;
         *unescaped_buf_size = (bit_count + 7) >> 3;
+        memset(s->buffer + *unescaped_buf_size, 0,
+               FF_INPUT_BUFFER_PADDING_SIZE);
     } else {
         *unescaped_buf_ptr  = *buf_ptr;
         *unescaped_buf_size = buf_end - *buf_ptr;