CVE-2021-47471 Information

Description

In the Linux kernel the following vulnerability has been resolved:

drm: mxsfb: Fix NULL pointer dereference crash on unload

The mxsfb->crtc.funcs may already be NULL when unloading the driver in which case calling mxsfb_irq_disable() via drm_irq_uninstall() from mxsfb_unload() leads to NULL pointer dereference.

Since all we care about is masking the IRQ and mxsfb->base is still valid just use that to clear and mask the IRQ.

Reference

https://git.kernel.org/stable/c/f40c2281d2c0674d32ba732fee45222d76495472 https://git.kernel.org/stable/c/b0e6db0656ddfd8bb57303c2ef61ee1c1cc694a8 https://git.kernel.org/stable/c/3cfc183052c3dbf8eae57b6c1685dab00ed3db4a