Commit db179e0d authored Sep 26, 2017 by Sergey Senozhatsky Committed by Rob Herring Oct 12, 2017

of: do not leak console options



Do not strdup() console options. It seems that the only reason for
it to be strdup()-ed was a compilation warning: printk, UART and
console drivers, for some reason, expect char pointer instead of
const char pointer. So we can just pass `of_stdout_options', but
need to cast it to char pointer. A better fix would be to change
printk, console drivers and UART to accept const char `options';
but that will take time - there are lots of drivers to update.

The patch also fixes a possible memory leak: add_preferred_console()
can fail, but we don't kfree() options.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Rob Herring <robh@kernel.org>

parent 8a5776a5

drivers/of/base.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -1781,8 +1781,12 @@ bool of_console_check(struct device_node dn, char name, int index)
		{
		if (!dn \|\| dn != of_stdout \|\| console_set_on_cmdline)
		return false;
		return !add_preferred_console(name, index,
		kstrdup(of_stdout_options, GFP_KERNEL));

		/*
		* XXX: cast `options' to char pointer to suppress complication
		* warnings: printk, UART and console drivers expect char pointer.
		*/
		return !add_preferred_console(name, index, (char *)of_stdout_options);
		}
		EXPORT_SYMBOL_GPL(of_console_check);