[FFmpeg-cvslog] filmstripdec: correctly check image dimensions

[Andreas Cadhalpun]

ffmpeg | branch: release/3.2 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Sun Nov 13 18:22:12 2016 +0100| [b526958ca4a1b840d1c92b653451d9c582b51a1a] | committer: Andreas Cadhalpun

filmstripdec: correctly check image dimensions

This prevents a division by zero in read_packet.

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit 25012c56448a48487cdc9699465e640871dbcd60)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=b526958ca4a1b840d1c92b653451d9c582b51a1a
---

 libavformat/filmstripdec.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/libavformat/filmstripdec.c b/libavformat/filmstripdec.c
index 414e276..0aeb594 100644
--- a/libavformat/filmstripdec.c
+++ b/libavformat/filmstripdec.c
@@ -25,6 +25,7 @@
  */
 
 #include "libavutil/intreadwrite.h"
+#include "libavutil/imgutils.h"
 #include "avformat.h"
 #include "internal.h"
 
@@ -68,10 +69,8 @@ static int read_header(AVFormatContext *s)
     st->codecpar->height     = avio_rb16(pb);
     film->leading         = avio_rb16(pb);
 
-    if (st->codecpar->width * 4LL * st->codecpar->height >= INT_MAX) {
-        av_log(s, AV_LOG_ERROR, "dimensions too large\n");
-        return AVERROR_PATCHWELCOME;
-    }
+    if (av_image_check_size(st->codecpar->width, st->codecpar->height, 0, s) < 0)
+        return AVERROR_INVALIDDATA;
 
     avpriv_set_pts_info(st, 64, 1, avio_rb16(pb));