Calling setenv(3) as setenv("foo", NULL, 1) will SEGV.  This
should return EINVAL as with setenv(NULL, "foo", 1).

--lyndon



--- setenv.c.orig	Fri Mar 13 13:19:06 2026
+++ setenv.c	Fri Mar 13 13:20:21 2026
@@ -95,7 +95,7 @@
 	const char *np;
 	int l_value, offset = 0;
 
-	if (!name || !*name) {
+	if (!name || !*name || !value) {
 		errno = EINVAL;
 		return (-1);
 	}

--- getenv.3.orig	Fri Mar 13 13:32:01 2026
+++ getenv.3	Fri Mar 13 13:32:08 2026
@@ -128,6 +128,12 @@
 character.
 .Pp
 The
+.Fn setenv
+function
+.Ar value
+was passed a NULL pointer.
+.Pp
+The
 .Fn putenv
 function was passed a
 .Ar string