CVE-2021-47278 Information

Description

In the Linux kernel the following vulnerability has been resolved:

bus: mhi: pci_generic: Fix possible use-after-free in mhi_pci_remove()

This driver’s remove path calls del_timer(). However that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver’s remove function has finished which would result in a use-after-free.

Fix by calling del_timer_sync() which makes sure the timer handler has finished and unable to re-schedule itself.

Reference

https://git.kernel.org/stable/c/c597d5c59c7a6417dba06590f59b922e01188e8d https://git.kernel.org/stable/c/0b67808ade8893a1b3608ddd74fac7854786c919