[PATCH v1] usb: gadget: autostart: properly release f_multi_opts

[PATCH v1] usb: gadget: autostart: properly release f_multi_opts

[Oleksij Rempel]

the same as for usb gadget autostarter.

|commit 2b9bcff79a02f770fa730e2689ba35cc03c0da7d
|Author: Sascha Hauer <s.hauer@pengutronix.de>
|Date:   Fri Jan 20 10:03:45 2017 +0100
|
|    usb: gadget: properly release f_multi_opts
|
|    The usbgadget commands uses statically allocated f_multi_opts and passes
|    this to usb_multi_register(). These f_multi_opts are of course no
|    longer valid when we leave the usbgadget command. Luckily we do not use
|    the data after we left the usbgadget command, so this never has been a
|    problem. However, f_multi_opts has some allocated members which we can
|    not free anymore on gadget unregistration because we no longer have the
|    pointer to them.
|
|    Fix this by adding a release function to struct f_multi_opts. This way
|    we can allocate all memory dynamically and properly free it when not
|    used anymore.
|
|    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/usb/gadget/autostart.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/autostart.c b/drivers/usb/gadget/autostart.c
index 4ad1dd6be1..465d8fd380 100644
--- a/drivers/usb/gadget/autostart.c
+++ b/drivers/usb/gadget/autostart.c
@@ -31,19 +31,28 @@ static char *fastboot_function;
 
 static int usbgadget_autostart(void)
 {
-	struct f_multi_opts opts = {};
+	struct f_multi_opts *opts;
+	int ret;
 
 	if (!autostart)
 		return 0;
 
 	setenv("otg.mode", "peripheral");
 
+	opts = xzalloc(sizeof(*opts));
+	opts->release = usb_multi_opts_release;
+
 	if (fastboot_function)
-		opts.fastboot_opts.files = file_list_parse(fastboot_function);
+		opts->fastboot_opts.files = file_list_parse(fastboot_function);
+
+	opts->create_acm = acm;
+
 
-	opts.create_acm = acm;
+	ret = usb_multi_register(opts);
+	if (ret)
+		usb_multi_opts_release(opts);
 
-	return usb_multi_register(&opts);
+	return ret;
 }
 postenvironment_initcall(usbgadget_autostart);
 
-- 
2.11.0


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Re: [PATCH v1] usb: gadget: autostart: properly release f_multi_opts

[Sascha Hauer]

On Wed, Jul 26, 2017 at 05:50:14PM +0200, Oleksij Rempel wrote:
> the same as for usb gadget autostarter.
> 
> |commit 2b9bcff79a02f770fa730e2689ba35cc03c0da7d
> |Author: Sascha Hauer <s.hauer@pengutronix.de>
> |Date:   Fri Jan 20 10:03:45 2017 +0100
> |
> |    usb: gadget: properly release f_multi_opts
> |
> |    The usbgadget commands uses statically allocated f_multi_opts and passes
> |    this to usb_multi_register(). These f_multi_opts are of course no
> |    longer valid when we leave the usbgadget command. Luckily we do not use
> |    the data after we left the usbgadget command, so this never has been a
> |    problem. However, f_multi_opts has some allocated members which we can
> |    not free anymore on gadget unregistration because we no longer have the
> |    pointer to them.
> |
> |    Fix this by adding a release function to struct f_multi_opts. This way
> |    we can allocate all memory dynamically and properly free it when not
> |    used anymore.
> |
> |    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> 
> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  drivers/usb/gadget/autostart.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/usb/gadget/autostart.c b/drivers/usb/gadget/autostart.c
> index 4ad1dd6be1..465d8fd380 100644
> --- a/drivers/usb/gadget/autostart.c
> +++ b/drivers/usb/gadget/autostart.c
> @@ -31,19 +31,28 @@ static char *fastboot_function;
>  
>  static int usbgadget_autostart(void)
>  {
> -	struct f_multi_opts opts = {};
> +	struct f_multi_opts *opts;
> +	int ret;
>  
>  	if (!autostart)
>  		return 0;
>  
>  	setenv("otg.mode", "peripheral");
>  
> +	opts = xzalloc(sizeof(*opts));
> +	opts->release = usb_multi_opts_release;
> +
>  	if (fastboot_function)
> -		opts.fastboot_opts.files = file_list_parse(fastboot_function);
> +		opts->fastboot_opts.files = file_list_parse(fastboot_function);
> +
> +	opts->create_acm = acm;
> +
>  
> -	opts.create_acm = acm;
> +	ret = usb_multi_register(opts);
> +	if (ret)
> +		usb_multi_opts_release(opts);
>  
> -	return usb_multi_register(&opts);
> +	return ret;
>  }
>  postenvironment_initcall(usbgadget_autostart);
>  
> -- 
> 2.11.0
> 
> 
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> 

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