security(hevc): bound specification equation parsing (#2884)

2026-11-02 18:09:21 +00:00 · 2026-10-24 10:50:53 +02:00
parent f30c6be228
commit 5f2a77e3c8
1 changed files with 3 additions and 1 deletions
@@ -187,7 +187,9 @@ w("")
 def taps(eq_no, var, n):
    for l in lines:
        if "(%s)" % eq_no in l:
-            expr = l.split("=", 1)[1].split(">>")[0]
+            expr = " ".join(l.split("=", 1)[1].split(">>")[0].split())
+            if len(expr) > 8192:
+                raise SystemExit("equation %s is unexpectedly long" % eq_no)
            coef = {}
            for sign, c, k in re.findall(r"([+-]?)\s*(?:(\d+)\s*\*\s*)?%s0,\s*(-?\d)" % var, expr):
                coef[int(k)] = (-1 if sign == "-" else 1) * (int(c) if c else 1)