scc

commit 1a8979366fae2352f66712363b1d49f4bd3c9a10
parent 978a8ca13e0a40616ed5525663653d82efaa8eb4
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Mon, 24 Oct 2022 17:47:00 +0200

cc1: Avoid undefined behaviour

A compound literal has a timelife limited to the scope where it
is defined and in this case the object was accessed out of its
timelife.

Diffstat:
M
src/cmd/cc/cc1/decl.c
 | 
3
++-

1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/cmd/cc/cc1/decl.c b/src/cmd/cc/cc1/decl.c
@@ -494,6 +494,7 @@ funbody(Symbol *sym, Symbol *pars[])
 {
 	Type *tp;
 	Symbol **bp, *p;
+	Symbol *emptypars[] = {NULL};
 
 	if (!sym)
 		return 0;
@@ -510,7 +511,7 @@ funbody(Symbol *sym, Symbol *pars[])
 			assert(!pars);
 			errorp("typedef'ed function type cannot be instantiated");
 			curctx = PARAMCTX;
-			pars = (Symbol *[]) {NULL};
+			pars = emptypars;
 		}
 
 		if (curctx != PARAMCTX)