linux-kernel - [PATCH] of: do not leak console options

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Message-Id: <20170825173647.1004-1-sergey.senozhatsky@gmail.com>
Date:   Sat, 26 Aug 2017 02:36:47 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCH] of: do not leak console options

If add_preferred_console() returns error then we must free a
copy of `of_stdout_options' that we create right before the
console registration.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
---
 drivers/of/base.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 260d33c0f26c..9fcf7011d206 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1779,10 +1779,17 @@ EXPORT_SYMBOL_GPL(of_alias_get_highest_id);
  */
 bool of_console_check(struct device_node *dn, char *name, int index)
 {
+	bool ret;
+	char *options;
+
 	if (!dn || dn != of_stdout || console_set_on_cmdline)
 		return false;
-	return !add_preferred_console(name, index,
-				      kstrdup(of_stdout_options, GFP_KERNEL));
+
+	options = kstrdup(of_stdout_options, GFP_KERNEL);
+	ret = add_preferred_console(name, index, options);
+	if (ret)
+		kfree(options);
+	return !ret;
 }
 EXPORT_SYMBOL_GPL(of_console_check);
 
-- 
2.14.1