prevent crash when dba params are invalid

Originally committed as revision 13653 to svn://svn.ffmpeg.org/ffmpeg/trunk
17 years ago · 31bc6b4549
parent d326dd9797
commit 31bc6b4549
1 changed files with 2 additions and 2 deletions
--- a/libavcodec/ac3.c
+++ b/libavcodec/ac3.c
@ -157,8 +157,8 @@ void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
    if (dba_mode == DBA_REUSE || dba_mode == DBA_NEW) {
        int band, seg, delta;
        band = 0;
-        for (seg = 0; seg < dba_nsegs; seg++) {
-            band += dba_offsets[seg];
+        for (seg = 0; seg < FFMIN(8, dba_nsegs); seg++) {
+            band = FFMIN(49, band + dba_offsets[seg]);
            if (dba_values[seg] >= 4) {
                delta = (dba_values[seg] - 3) << 7;
            } else {