CVE-2021-47165 Information

Description

In the Linux kernel the following vulnerability has been resolved:

drm/meson: fix shutdown crash when component not probed

When main component is not probed by example when the dw-hdmi module is not loaded yet or in probe defer the following crash appears on shutdown:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038 … pc : meson_drv_shutdown+0x24/0x50 lr : platform_drv_shutdown+0x20/0x30 … Call trace: meson_drv_shutdown+0x24/0x50 platform_drv_shutdown+0x20/0x30 device_shutdown+0x158/0x360 kernel_restart_prepare+0x38/0x48 kernel_restart+0x18/0x68 __do_sys_reboot+0x224/0x250 __arm64_sys_reboot+0x24/0x30 …

Simply check if the priv struct has been allocated before using it.

Reference

https://git.kernel.org/stable/c/b4298d33c1fcce511ffe84d8d3de07e220300f9b https://git.kernel.org/stable/c/e256a0eb43e17209e347409a80805b1659398d68 https://git.kernel.org/stable/c/4ce2bf20b4a6e307e114847d60b2bf40a6a1fac0 https://git.kernel.org/stable/c/d66083c0d6f5125a4d982aa177dd71ab4cd3d212 https://git.kernel.org/stable/c/b4b91033a0b11fe9ade58156cd9168f89f4a8c1a https://git.kernel.org/stable/c/7cfc4ea78fc103ea51ecbacd9236abb5b1c490d2