If the username we are trying to look up in the db files won't fit into

the buffer then act like it doesn't exist. The buffer is always big enough
for any valid username.

PR:		27860
Reviewed by:	nectar

lib/libc/gen/getpwent.c

@@ -386,7 +386,9 @@ _local_getpw(rv, cb_data, ap)
 	case _PW_KEYBYNAME:
 		name = va_arg(ap, const char *);
 		len = strlen(name);
-		memmove(bf + 1, name, (size_t)MIN(len, MAXLOGNAME));
+		if (len > sizeof(bf) - 1)
+			return NS_NOTFOUND;
+		memmove(bf + 1, name, len);
 		key.size = len + 1;
 		break;
 	case _PW_KEYBYUID: