X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/1ba28e2b955b005ce4825fec792df17f75a8de1e..a5b5269546e02d1f2e90000e79df8409d4f269db:/src/src/expand.c

diff --git a/src/src/expand.c b/src/src/expand.c
index bf425ae81..fece8c150 100644
--- a/src/src/expand.c
+++ b/src/src/expand.c
@@ -3106,9 +3106,21 @@ if (*error == NULL)
     int op = *s++;
     int y = eval_op_unary(&s, decimal, error);
     if (*error != NULL) break;
-    if (op == '*') x *= y;
-      else if (op == '/') x /= y;
-      else x %= y;
+    if (op == '*')
+      x *= y;
+    else
+      {
+      if (y == 0)
+        {
+        *error = (op == '/') ? US"divide by zero" : US"modulo by zero";
+        x = 0;
+        break;
+        }
+      if (op == '/')
+        x /= y;
+      else
+        x %= y;
+      }
     }
   }
 *sptr = s;