From: Clifford Wolf <clifford@clifford.at>
Date: Wed, 26 Jun 2019 09:09:43 +0000 (+0200)
Subject: Fix segfault on failed VERILOG_FRONTEND::const2ast, closes #1131
X-Git-Tag: yosys-0.9~41
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f6053b88103bfc652dec1959f30bfb1880613f61;p=yosys.git

Fix segfault on failed VERILOG_FRONTEND::const2ast, closes #1131

Signed-off-by: Clifford Wolf <clifford@clifford.at>
---

diff --git a/frontends/verilog/const2ast.cc b/frontends/verilog/const2ast.cc
index 3a3634d34..f6a17b242 100644
--- a/frontends/verilog/const2ast.cc
+++ b/frontends/verilog/const2ast.cc
@@ -153,7 +153,7 @@ AstNode *VERILOG_FRONTEND::const2ast(std::string code, char case_type, bool warn
 {
 	if (warn_z) {
 		AstNode *ret = const2ast(code, case_type);
-		if (std::find(ret->bits.begin(), ret->bits.end(), RTLIL::State::Sz) != ret->bits.end())
+		if (ret != nullptr && std::find(ret->bits.begin(), ret->bits.end(), RTLIL::State::Sz) != ret->bits.end())
 			log_warning("Yosys has only limited support for tri-state logic at the moment. (%s:%d)\n",
 				current_filename.c_str(), get_line_num());
 		return ret;