motionpixels: clip VLC codes.

Fixes invalid reads. Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC:libav-stable@libav.org
11 years ago · ca41c72c6d
parent 8b516f154a
commit ca41c72c6d
1 changed files with 1 additions and 0 deletions
--- a/libavcodec/motionpixels.c
+++ b/libavcodec/motionpixels.c
@ -180,6 +180,7 @@ static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
    int i;

    i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
+    i = FFMIN(i, FF_ARRAY_ELEMS(mp->codes) - 1);
    return mp->codes[i].delta;
 }