CVE-2021-47334

In the Linux kernel, the following vulnerability has been resolved:
misc/libmasm/module: Fix two use after free in ibmasm_init_one In
ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside
ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by
input_allocate_device(), and assigned to sp->remote.mouse_dev and
sp->remote.keybd_dev respectively. In the err_free_devices error branch of
ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(),
and return error. Then the execution runs into error_send_message error
branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called
to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My
patch add a “error_init_remote” label to handle the error of
ibmasm_init_remote_input_dev(), to avoid the uaf bugs.