Prevent the ASCII linker script directive from generating huge amounts of...

Prevent the ASCII linker script directive from generating huge amounts of padding if the size expression is not a constant.

 PR 30193 * ldgram.y (ASCII): Fail if the size is not a constant.

ld/ChangeLog

+2023-03-03  Nick Clifton  <nickc@redhat.com>
+
+	PR 30193
+	* ldgram.y (ASCII): Fail if the size is not a constant.
+
 2023-02-23  Fangrui Song  <i@maskray.me>
 
 	* emultempl/riscvelf.em: Add option parsing.

ld/ldgram.y

@@ -672,7 +672,10 @@ statement:
 		{
 		  /* 'value' is a memory leak, do we care?  */
 		  etree_type *value = $3;
-		  lang_add_string (value->value.value, $5);
+		  if (value->type.node_code == INT)
+		    lang_add_string (value->value.value, $5);
+		  else
+		    einfo (_("%X%P:%pS: ASCII expression must be an integer\n"), NULL);
 		}
 	| ASCIZ NAME
 		{