From: Martin Liska <mliska@suse.cz>
Date: Mon, 6 Dec 2021 12:02:22 +0000 (+0100)
Subject: D: fix UBSAN
X-Git-Tag: basepoints/gcc-13~2459
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5791bf7a0a7705be6c3989c445e7c739220f3290;p=thirdparty%2Fgcc.git

D: fix UBSAN

Fixes:
gcc/d/expr.cc:2596:9: runtime error: null pointer passed as argument 2, which is declared to never be null

gcc/d/ChangeLog:

	* expr.cc: Call memcpy only when length != 0.
---

diff --git a/gcc/d/expr.cc b/gcc/d/expr.cc
index 2831eefc4ba6..8e1d43e2b8f8 100644
--- a/gcc/d/expr.cc
+++ b/gcc/d/expr.cc
@@ -2598,7 +2598,8 @@ public:
 	/* Copy the string contents to a null terminated string.  */
 	dinteger_t length = (e->len * e->sz);
 	char *string = XALLOCAVEC (char, length + 1);
-	memcpy (string, e->string, length);
+	if (length > 0)
+	  memcpy (string, e->string, length);
 	string[length] = '\0';
 
 	/* String value and type includes the null terminator.  */