Merge tag 'bootconfig-fixes-v6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull bootconfig fixes from Masami Hiramatsu:

- Fix potential static_command_line buffer overrun.

Currently we allocate the memory for static_command_line based on
"boot_command_line", but it will copy "command_line" into it. So we
use the length of "command_line" instead of "boot_command_line" (as
we previously did)

- Use memblock_free_late() in xbc_exit() instead of memblock_free()
after the buddy system is initialized

- Fix a kerneldoc warning

* tag 'bootconfig-fixes-v6.9-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
bootconfig: Fix the kerneldoc of _xbc_exit()
bootconfig: use memblock_free_late to free xbc memory to buddy
init/main.c: Fix potential static_command_line memory overflow

include/linux/bootconfig.h

···
 int __init xbc_get_info(int *node_size, size_t *data_size);
 
 /* XBC cleanup data structures */
-void __init xbc_exit(void);
+void __init _xbc_exit(bool early);
+
+static inline void xbc_exit(void)
+{
+	_xbc_exit(false);
+}
 
 /* XBC embedded bootconfig data in kernel */
 #ifdef CONFIG_BOOT_CONFIG_EMBED

init/main.c

···
 	if (!saved_command_line)
 		panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
 
+	len = xlen + strlen(command_line) + 1;
+
 	static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
 	if (!static_command_line)
 		panic("%s: Failed to allocate %zu bytes\n", __func__, len);

lib/bootconfig.c

···
 	return memblock_alloc(size, SMP_CACHE_BYTES);
 }
 
-static inline void __init xbc_free_mem(void *addr, size_t size)
+static inline void __init xbc_free_mem(void *addr, size_t size, bool early)
 {
-	memblock_free(addr, size);
+	if (early)
+		memblock_free(addr, size);
+	else if (addr)
+		memblock_free_late(__pa(addr), size);
 }
 
 #else /* !__KERNEL__ */
···
 	return malloc(size);
 }
 
-static inline void xbc_free_mem(void *addr, size_t size)
+static inline void xbc_free_mem(void *addr, size_t size, bool early)
 {
 	free(addr);
 }
···
 }
 
 /**
- * xbc_exit() - Clean up all parsed bootconfig
+ * _xbc_exit() - Clean up all parsed bootconfig
+ * @early: Set true if this is called before budy system is initialized.
  *
  * This clears all data structures of parsed bootconfig on memory.
  * If you need to reuse xbc_init() with new boot config, you can
  * use this.
  */
-void __init xbc_exit(void)
+void __init _xbc_exit(bool early)
 {
-	xbc_free_mem(xbc_data, xbc_data_size);
+	xbc_free_mem(xbc_data, xbc_data_size, early);
 	xbc_data = NULL;
 	xbc_data_size = 0;
 	xbc_node_num = 0;
-	xbc_free_mem(xbc_nodes, sizeof(struct xbc_node) * XBC_NODE_MAX);
+	xbc_free_mem(xbc_nodes, sizeof(struct xbc_node) * XBC_NODE_MAX, early);
 	xbc_nodes = NULL;
 	brace_index = 0;
 }
···
 	if (!xbc_nodes) {
 		if (emsg)
 			*emsg = "Failed to allocate bootconfig nodes";
-		xbc_exit();
+		_xbc_exit(true);
 		return -ENOMEM;
 	}
 	memset(xbc_nodes, 0, sizeof(struct xbc_node) * XBC_NODE_MAX);
···
 			*epos = xbc_err_pos;
 		if (emsg)
 			*emsg = xbc_err_msg;
-		xbc_exit();
+		_xbc_exit(true);
 	} else
 		ret = xbc_node_num;