[FFmpeg-cvslog] rv10: check size of s->mb_width * s->mb_height

[Andreas Cadhalpun]

ffmpeg | branch: release/1.1 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Tue Mar  3 21:31:15 2015 +0100| [ded9931d165544c342795a1b66e4777b6e7daeb0] | committer: Vittorio Giovara

rv10: check size of s->mb_width * s->mb_height

If it doesn't fit into 12 bits it triggers an assertion.

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
Signed-off-by: Anton Khirnov <anton at khirnov.net>
Signed-off-by: Vittorio Giovara <vittorio.giovara at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ded9931d165544c342795a1b66e4777b6e7daeb0
---

 libavcodec/mpegvideo.h     |    2 +-
 libavcodec/mpegvideo_enc.c |    7 +++++--
 libavcodec/rv10enc.c       |    7 ++++++-
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/libavcodec/mpegvideo.h b/libavcodec/mpegvideo.h
index 38d9ab6..c965bbc 100644
--- a/libavcodec/mpegvideo.h
+++ b/libavcodec/mpegvideo.h
@@ -897,7 +897,7 @@ int ff_h261_get_picture_format(int width, int height);
 
 
 /* rv10.c */
-void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number);
+int ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number);
 int ff_rv_decode_dc(MpegEncContext *s, int n);
 void ff_rv20_encode_picture_header(MpegEncContext *s, int picture_number);
 
diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index f783dc7..987f8d0 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -3295,8 +3295,11 @@ static int encode_picture(MpegEncContext *s, int picture_number)
             ff_msmpeg4_encode_picture_header(s, picture_number);
         else if (CONFIG_MPEG4_ENCODER && s->h263_pred)
             ff_mpeg4_encode_picture_header(s, picture_number);
-        else if (CONFIG_RV10_ENCODER && s->codec_id == AV_CODEC_ID_RV10)
-            ff_rv10_encode_picture_header(s, picture_number);
+        else if (CONFIG_RV10_ENCODER && s->codec_id == AV_CODEC_ID_RV10) {
+            ret = ff_rv10_encode_picture_header(s, picture_number);
+            if (ret < 0)
+                return ret;
+        }
         else if (CONFIG_RV20_ENCODER && s->codec_id == AV_CODEC_ID_RV20)
             ff_rv20_encode_picture_header(s, picture_number);
         else if (CONFIG_FLV_ENCODER && s->codec_id == AV_CODEC_ID_FLV1)
diff --git a/libavcodec/rv10enc.c b/libavcodec/rv10enc.c
index d3cd12c..a2df8f1 100644
--- a/libavcodec/rv10enc.c
+++ b/libavcodec/rv10enc.c
@@ -28,7 +28,7 @@
 #include "mpegvideo.h"
 #include "put_bits.h"
 
-void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number)
+int ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number)
 {
     int full_frame= 0;
 
@@ -48,12 +48,17 @@ void ff_rv10_encode_picture_header(MpegEncContext *s, int picture_number)
     /* if multiple packets per frame are sent, the position at which
        to display the macroblocks is coded here */
     if(!full_frame){
+        if (s->mb_width * s->mb_height >= (1U << 12)) {
+            av_log_missing_feature(s->avctx, "Encoding frames with 4096 macroblocks or more", 0);
+            return AVERROR(ENOSYS);
+        }
         put_bits(&s->pb, 6, 0); /* mb_x */
         put_bits(&s->pb, 6, 0); /* mb_y */
         put_bits(&s->pb, 12, s->mb_width * s->mb_height);
     }
 
     put_bits(&s->pb, 3, 0);     /* ignored */
+    return 0;
 }
 
 FF_MPV_GENERIC_CLASS(rv10)