[FFmpeg-cvslog] mpeg4videodec: only allow a positive length

[Andreas Cadhalpun]

ffmpeg | branch: release/2.2 | Andreas Cadhalpun <andreas.cadhalpun at googlemail.com> | Wed Apr 22 16:32:42 2015 +0200| [e96e0e1333c8292bd7720ee7cb7e44c935aa74a6] | committer: Michael Niedermayer

mpeg4videodec: only allow a positive length

Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit b3408ae4c64cb674b1d5f0f30171759113ce722a)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e96e0e1333c8292bd7720ee7cb7e44c935aa74a6
---

 libavcodec/mpeg4videodec.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index a1f530c..18f63b9 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -186,14 +186,14 @@ static int mpeg4_decode_sprite_trajectory(Mpeg4DecContext *ctx, GetBitContext *g
         int x = 0, y = 0;
 
         length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
-        if (length)
+        if (length > 0)
             x = get_xbits(gb, length);
 
         if (!(ctx->divx_version == 500 && ctx->divx_build == 413))
             skip_bits1(gb);     /* marker bit */
 
         length = get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
-        if (length)
+        if (length > 0)
             y = get_xbits(gb, length);
 
         skip_bits1(gb);         /* marker bit */