Do not read out of array bounds.

Originally committed as revision 13053 to svn://svn.ffmpeg.org/ffmpeg/trunk
17 years ago · 0ec7b71de8
parent f7739f3708
commit 0ec7b71de8
1 changed files with 4 additions and 0 deletions
--- a/libavcodec/flac.c
+++ b/libavcodec/flac.c
@ -279,9 +279,13 @@ static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
    if (decode_residuals(s, channel, pred_order) < 0)
        return -1;

+    if(pred_order > 0)
    a = decoded[pred_order-1];
+    if(pred_order > 1)
    b = a - decoded[pred_order-2];
+    if(pred_order > 2)
    c = b - decoded[pred_order-2] + decoded[pred_order-3];
+    if(pred_order > 3)
    d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];

    switch(pred_order)