linux-kernel - [PATCH 5.10 04/21] bootconfig: init: Fix memblock leak in xbc_make

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Date:   Fri, 19 Nov 2021 18:37:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>
Subject: [PATCH 5.10 04/21] bootconfig: init: Fix memblock leak in xbc_make_cmdline()

From: Masami Hiramatsu <mhiramat@...nel.org>

commit 1ae43851b18afe861120ebd7c426dc44f06bb2bd upstream.

Free unused memblock in a error case to fix memblock leak
in xbc_make_cmdline().

Link: https://lkml.kernel.org/r/163177339181.682366.8713781325929549256.stgit@devnote2

Fixes: 51887d03aca1 ("bootconfig: init: Allow admin to use bootconfig for kernel command line")
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 init/main.c |    1 +
 1 file changed, 1 insertion(+)

--- a/init/main.c
+++ b/init/main.c
@@ -380,6 +380,7 @@ static char * __init xbc_make_cmdline(co
 	ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
 	if (ret < 0 || ret > len) {
 		pr_err("Failed to print extra kernel cmdline.\n");
+		memblock_free(__pa(new_cmdline), len + 1);
 		return NULL;
 	}