[FFmpeg-cvslog] flashsv: Initialize the block array

[Luca Barbato]

ffmpeg | branch: master | Luca Barbato <lu_zero at gentoo.org> | Sun Nov  1 04:07:48 2015 +0100| [50d2a3b5f34e6f99e5ffe17f2be5eb1815555960] | committer: Luca Barbato

flashsv: Initialize the block array

Otherwise flashsv2_prime could be fed random data.

Bug-Id: 908
CC: libav-stable at libav.org

Signed-off-by: Luca Barbato <lu_zero at gentoo.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=50d2a3b5f34e6f99e5ffe17f2be5eb1815555960
---

 libavcodec/flashsv.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/flashsv.c b/libavcodec/flashsv.c
index ee854ac..2cf8f3f 100644
--- a/libavcodec/flashsv.c
+++ b/libavcodec/flashsv.c
@@ -339,12 +339,14 @@ static int flashsv_decode_frame(AVCodecContext *avctx, void *data,
     s->is_keyframe = (avpkt->flags & AV_PKT_FLAG_KEY) && (s->ver == 2);
     if (s->is_keyframe) {
         int err;
+        int nb_blocks = (v_blocks + !!v_part) *
+                        (h_blocks + !!h_part) * sizeof(s->blocks[0]);
         if ((err = av_reallocp(&s->keyframedata, avpkt->size)) < 0)
             return err;
         memcpy(s->keyframedata, avpkt->data, avpkt->size);
-        if ((err = av_reallocp(&s->blocks, (v_blocks + !!v_part) *
-                               (h_blocks + !!h_part) * sizeof(s->blocks[0]))) < 0)
+        if ((err = av_reallocp(&s->blocks, nb_blocks)) < 0)
             return err;
+        memset(s->blocks, 0, nb_blocks);
     }
 
     ff_dlog(avctx, "image: %dx%d block: %dx%d num: %dx%d part: %dx%d\n",