title: drm/meson: fix shutdown crash when component not probed
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.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 8a5160cc8488, lessThan: b4298d33c1fc, status: affected, versionType: git
version: 8fbbf2b38494, lessThan: e256a0eb43e1, status: affected, versionType: git
version: d2100ef32a8c, lessThan: 4ce2bf20b4a6, status: affected, versionType: git
version: d4ec1ffbdaa8, lessThan: d66083c0d6f5, status: affected, versionType: git
version: fa0c16caf3d7, lessThan: b4b91033a0b1, status: affected, versionType: git
version: fa0c16caf3d7, lessThan: 7cfc4ea78fc1, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 5.12, status: affected
version: 0, lessThan: 5.12, status: unaffected, versionType: custom
version: 4.14.235, lessThanOrEqual: 4.14.*, status: unaffected, versionType: custom
version: 4.19.193, lessThanOrEqual: 4.19.*, status: unaffected, versionType: custom
version: 5.4.124, lessThanOrEqual: 5.4.*, status: unaffected, versionType: custom
version: 5.10.42, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.12.9, lessThanOrEqual: 5.12.*, status: unaffected, versionType: custom
version: 5.13, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
