[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 at 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 at pengutronix.de>

Signed-off-by: Oleksij Rempel <o.rempel at 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