snowdec: add 2 av_asserts to check run validity

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
12 years ago · 6ecf1eb0dd
parent 4a596d19ff
commit 6ecf1eb0dd
1 changed files with 3 additions and 1 deletions
--- a/libavcodec/snow.h
+++ b/libavcodec/snow.h
@ -664,11 +664,13 @@ static inline void unpack_coeffs(SnowContext *s, SubBand *b, SubBand * parent, i
                    int max_run;
                    run--;
                    v=0;
-
+                    av_assert2(run >= 0);
                    if(y) max_run= FFMIN(run, prev_xc->x - x - 2);
                    else  max_run= FFMIN(run, w-x-1);
                    if(parent_xc)
                        max_run= FFMIN(max_run, 2*parent_xc->x - x - 1);
+                    av_assert2(max_run >= 0 && max_run <= run);
+
                    x+= max_run;
                    run-= max_run;
                }