From e8a6a67b3c84fce435c3320b20d789001a158379 Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Fri, 11 Oct 2019 09:53:00 +0100
Subject: [PATCH] bytestring.c (bytestring_pyrepeat): Don't divide by zero.

---
 bytestring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bytestring.c b/bytestring.c
index a7fe5cb..82d117f 100644
--- a/bytestring.c
+++ b/bytestring.c
@@ -165,7 +165,7 @@ static PyObject *bytestring_pyrepeat(PyObject *me, Py_ssize_t n)
 
   xp = (const unsigned char *)PyString_AS_STRING(me);
   xsz = PyString_GET_SIZE(me);
-  if (n < 0 || xsz >= (size_t)-1/n) VALERR("too long");
+  if (n < 0 || (n && xsz >= (size_t)-1/n)) VALERR("too long");
   zsz = n*xsz; z = bytestring_pywrap(0, zsz); zp = PyString_AS_STRING(z);
   if (xsz == 1) memset(zp, *xp, zsz);
   else while (zsz) { memcpy(zp, xp, xsz); zp += xsz; zsz -= xsz; }
-- 
2.11.0