Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: net: hibmcge: fix rtnl deadlock issue Currently, the hibmcge netdev acquires the rtnl_lock in pci_error_handlers.reset_prepare() and releases it in pci_error_handlers.reset_done(). However, in the PCI framework: pci_reset_bus - __pci_reset_slot - pci_slot_save_and_disable_locked - pci_dev_save_and_disable - err_handler->reset_prepare(dev); In pci_slot_save_and_disable_locked(): list_for_each_entry(dev, &slot->bus->devices, bus_list) { if (!dev->slot || dev->slot!= slot) continue; pci_dev_save_and_disable(dev); if (dev->subordinate) pci_bus_save_and_disable_locked(dev->subordinate); } This will iterate through all devices under the current bus and execute err_handler->reset_prepare(), causing two devices of the hibmcge driver to sequentially request the rtnl_lock, leading to a deadlock. Since the driver now executes netif_device_detach() before the reset process, it will not concurrently with other netdev APIs, so there is no need to hold the rtnl_lock now. Therefore, this patch removes the rtnl_lock during the reset process and adjusts the position of HBG_NIC_STATE_RESETTING to ensure that multiple resets are not executed concurrently.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3f5a61f6d504f55ed1a36cce044d5123d508721f before d85a6346fd6f595c4914205762d0cdf35c004a5e; affected 3f5a61f6d504f55ed1a36cce044d5123d508721f before 1343a8994ca7dba78f5dd818e89d68331c21c35d; affected 3f5a61f6d504f55ed1a36cce044d5123d508721f before c875503a9b9082928d7d3fc60b5400d16fbfae4e |
| Linux / Linux | affected 6.14; unaffected 0 before 6.14; unaffected 6.15.11 through 6.15.*; unaffected 6.16.2 through 6.16.*; unaffected 6.17 through * |
CWE
No CWE identifiers supplied.