Описание
In the Linux kernel, the following vulnerability has been resolved:
fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal
CXL is linked before fwctl in drivers/Makefile. Both use module_init, so cxl_pci_driver_init()runs first. Whencxl_pci_probe()callsfwctl_register()and thendevice_add(), fwctl_class is not yet registered because fwctl_init() hasn't run, causing class_to_subsys()` to
return NULL and skip knode_class initialization.
On device removal, class_to_subsys() returns non-NULL, and
device_del() calls klist_del() on the uninitialized knode, triggering
a NULL pointer dereference.
In the Linux kernel, the following vulnerability has been resolved:
fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal
CXL is linked before fwctl in drivers/Makefile. Both use module_init, so cxl_pci_driver_init()runs first. Whencxl_pci_probe()callsfwctl_register()and thendevice_add(), fwctl_class is not yet registered because fwctl_init() hasn't run, causing class_to_subsys()` to
return NULL and skip knode_class initialization.
On device removal, class_to_subsys() returns non-NULL, and
device_del() calls klist_del() on the uninitialized knode, triggering
a NULL pointer dereference.
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal CXL is linked before fwctl in drivers/Makefile. Both use `module_init, so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls `fwctl_register()` and then `device_add()`, fwctl_class is not yet registered because fwctl_init() hasn't run, causing `class_to_subsys()` to return NULL and skip knode_class initialization. On device removal, `class_to_subsys()` returns non-NULL, and `device_del()` calls `klist_del()` on the uninitialized knode, triggering a NULL pointer dereference.
In the Linux kernel, the following vulnerability has been resolved: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal CXL is linked before fwctl in drivers/Makefile. Both use `module_init, so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls `fwctl_register()` and then `device_add()`, fwctl_class is not yet registered because fwctl_init() hasn't run, causing `class_to_subsys()` to return NULL and skip knode_class initialization. On device removal, `class_to_subsys()` returns non-NULL, and `device_del()` calls `klist_del()` on the uninitialized knode, triggering a NULL pointer dereference.
In the Linux kernel, the following vulnerability has been resolved: fwctl: Fix class init ordering to avoid NULL pointer dereference on device removal CXL is linked before fwctl in drivers/Makefile. Both use `module_init, so `cxl_pci_driver_init()` runs first. When `cxl_pci_probe()` calls `fwctl_register()` and then `device_add()`, fwctl_class is not yet registered because fwctl_init() hasn't run, causing `class_to_subsys()` to return NULL and skip knode_class initialization. On device removal, `class_to_subsys()` returns non-NULL, and `device_del()` calls `klist_del()` on the uninitialized knode, triggering a NULL pointer dereference.
In the Linux kernel, the following vulnerability has been resolved: f ...