From: Maria Matejka <mq@ucw.cz>
Date: Wed, 14 Aug 2019 09:49:20 +0000 (+0200)
Subject: Filter: Don't alloc varargs array if its length would be zero
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f31be45de1a69f59327c3316c9d612b9248bd280;p=thirdparty%2Fbird.git

Filter: Don't alloc varargs array if its length would be zero
---

diff --git a/filter/decl.m4 b/filter/decl.m4
index 71ac8803a..a5cead756 100644
--- a/filter/decl.m4
+++ b/filter/decl.m4
@@ -143,7 +143,7 @@ FID_IFCONST([[
 }
 FID_IFCONST([[
   const struct f_inst **items = NULL;
-  if (constargs) {
+  if (constargs && whati->varcount) {
     items = alloca(whati->varcount * sizeof(struct f_inst *));
     const struct f_inst *child = fvar;
     for (uint i=0; child; i++)