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.

• linux linux kernel (< 4.4.276) • linux linux kernel (>= 4.5 < 4.9.276) • linux linux kernel (>= 4.10 < 4.14.240) • linux linux kernel (>= 4.15 < 4.19.198) • linux linux kernel (>= 4.20 < 5.4.134) • linux linux kernel (>= 5.5 < 5.10.52) • linux linux kernel (>= 5.11 < 5.12.19) • linux linux kernel (>= 5.13 < 5.13.4)