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linux/drivers/pci/pcie
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Ding Hui 4203722d51 PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free 
[ Upstream commit 456d8aa37d ]

Struct pcie_link_state->downstream is a pointer to the pci_dev of function
0.  Previously we retained that pointer when removing function 0, and
subsequent ASPM policy changes dereferenced it, resulting in a
use-after-free warning from KASAN, e.g.:

  # echo 1 > /sys/bus/pci/devices/0000:03:00.0/remove
  # echo powersave > /sys/module/pcie_aspm/parameters/policy

  BUG: KASAN: slab-use-after-free in pcie_config_aspm_link+0x42d/0x500
  Call Trace:
   kasan_report+0xae/0xe0
   pcie_config_aspm_link+0x42d/0x500
   pcie_aspm_set_policy+0x8e/0x1a0
   param_attr_store+0x162/0x2c0
   module_attr_store+0x3e/0x80

PCIe spec r6.0, sec 7.5.3.7, recommends that software program the same ASPM
Control value in all functions of multi-function devices.

Disable ASPM and free the pcie_link_state when any child function is
removed so we can discard the dangling pcie_link_state->downstream pointer
and maintain the same ASPM Control configuration for all functions.

[bhelgaas: commit log and comment]
Debugged-by: Zongquan Qin <qinzongquan@sangfor.com.cn>
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Fixes: b5a0a9b59c ("PCI/ASPM: Read and set up L1 substate capabilities")
Link: https://lore.kernel.org/r/20230507034057.20970-1-dinghui@sangfor.com.cn
Signed-off-by: Ding Hui <dinghui@sangfor.com.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-07-19 16:36:10 +02:00
..
aer.c PCI/AER: Remove redundant Device Control Error Reporting Enable 2023-01-26 17:06:13 -06:00
aer_inject.c PCI/AER: Update aer-inject URL 2022-03-02 11:26:17 -06:00
aspm.c PCI/ASPM: Disable ASPM on MFD function removal to avoid use-after-free 2023-07-19 16:36:10 +02:00
dpc.c PCI/PM: Drop pci_bridge_wait_for_secondary_bus() timeout parameter 2023-04-11 17:35:06 -05:00
edr.c PCI/EDR: Add edr_handle_event() comments 2023-04-07 17:39:53 -05:00
err.c PCI/ERR: Recognize disconnected devices in report_error_detected() 2022-06-08 15:08:40 -05:00
Kconfig PCI: pciehp: Enable by default if USB4 enabled 2022-11-15 09:25:21 -06:00
Makefile PCI/portdrv: Squash into portdrv.c 2022-10-24 14:57:30 -05:00
pme.c PCI/PME: Use PCI_POSSIBLE_ERROR() to check config reads 2021-11-18 14:13:18 -06:00
portdrv.c PCI/portdrv: Prevent LS7A Bus Master clearing on shutdown 2023-02-01 12:05:28 -06:00
portdrv.h PCI/portdrv: Move private things to portdrv.c 2022-10-24 14:57:30 -05:00
ptm.c PCI/PTM: Reorder functions in logical order 2022-09-12 15:29:52 -05:00
rcec.c PCI/RCEC: Fix RCiEP device to RCEC association 2021-03-10 15:10:46 -06:00