PCI: endpoint: Avoid creating sub-groups asynchronously

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: Avoid creating sub-groups asynchronously The asynchronous creation of sub-groups by a delayed work could lead to a NULL pointer dereference when the driver directory is removed before the work completes. The crash can be easily reproduced with the following commands: # cd /sys/kernel/config/pci_ep/functions/pci_epf_test # for i in {1..20}; do mkdir test && rmdir test; done BUG: kernel NULL pointer dereference, address: 0000000000000088 ... Call Trace: configfs_register_group+0x3d/0x190 pci_epf_cfs_work+0x41/0x110 process_one_work+0x18f/0x350 worker_thread+0x25a/0x3a0 Fix this issue by using configfs_add_default_group() API which does not have the deadlock problem as configfs_register_group() and does not require the delayed work handler. [mani: slightly reworded the description and added stable list]

References

• https://git.kernel.org/stable/c/fa9fb38f5fe9c80094c2138354d45cdc8d094d69
• https://git.kernel.org/stable/c/5f609b3bffd4207cf9f2c9b41e1978457a5a1ea9
• https://git.kernel.org/stable/c/8cb905eca73944089a0db01443c7628a9e87012d
• https://git.kernel.org/stable/c/d9af3cf58bb4c8d6dea4166011c780756b1138b5
• https://git.kernel.org/stable/c/24a253c3aa6d9a2cde46158ce9782e023bfbf32d
• https://git.kernel.org/stable/c/73cee890adafa2c219bb865356e08e7f82423fe5
• https://git.kernel.org/stable/c/7c5c7d06bd1f86d2c3ebe62be903a4ba42db4d2c