[PATCH v1 2/3] f_rockusb: Avoid use-after-free in the global pointer variable

Andy Shevchenko
2020-12-03T15:32:04Z

In case of usb_add_function() failure the error path has two issues:
- the potentially allocated structure isn't getting freed
- the global pointer variable is assigned to garbage

Fix the above mentioned issues by freeing memory and assigning NULL.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/usb/gadget/f_rockusb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/f_rockusb.c b/drivers/usb/gadget/f_rockusb.c
index 9dd10f9e9aa1..bd846ce9a77b 100644
--- a/drivers/usb/gadget/f_rockusb.c
+++ b/drivers/usb/gadget/f_rockusb.c
@@ -309,8 +309,9 @@ static int rockusb_add(struct usb_configuration *c)

status = usb_add_function(c, &f_rkusb->usb_function);
if (status) {
+ free(f_rkusb->buf_head);
free(f_rkusb);
- rockusb_func = f_rkusb;
+ rockusb_func = NULL;
}
return status;
}
--
2.29.2