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mpeg4videodec: only allow a positive length

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Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit b3408ae4c6)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Andreas Cadhalpun 2015-04-22 16:32:42 +02:00 committed by Michael Niedermayer
parent 8b9cfdc927
commit f7a6a6d591
1 changed files with 2 additions and 2 deletions
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4
libavcodec/mpeg4videodec.c
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@ -189,14 +189,14 @@ 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 */