https://github.com/torvalds/linux
Revision 54c6e2dd00c313d0add58e5befe62fe6f286d03b authored by Krzysztof =?utf-8?Q?Ha=C5=82asa?= on 01 March 2016, 06:07:18 UTC, committed by Bjorn Helgaas on 07 March 2016, 20:33:16 UTC
pci_create_root_bus() passes a "parent" pointer to pci_bus_assign_domain_nr(). When CONFIG_PCI_DOMAINS_GENERIC is defined, pci_bus_assign_domain_nr() dereferences that pointer. Many callers of pci_create_root_bus() supply a NULL "parent" pointer, which leads to a NULL pointer dereference error. 7c674700098c ("PCI: Move domain assignment from arm64 to generic code") moved the "parent" dereference from arm64 to generic code. Only arm64 used that code (because only arm64 defined CONFIG_PCI_DOMAINS_GENERIC), and it always supplied a valid "parent" pointer. Other arches supplied NULL "parent" pointers but didn't defined CONFIG_PCI_DOMAINS_GENERIC, so they used a no-op version of pci_bus_assign_domain_nr(). 8c7d14746abc ("ARM/PCI: Move to generic PCI domains") defined CONFIG_PCI_DOMAINS_GENERIC on ARM, and many ARM platforms use pci_common_init(), which supplies a NULL "parent" pointer. These platforms (cns3xxx, dove, footbridge, iop13xx, etc.) crash with a NULL pointer dereference like this while probing PCI: Unable to handle kernel NULL pointer dereference at virtual address 000000a4 PC is at pci_bus_assign_domain_nr+0x10/0x84 LR is at pci_create_root_bus+0x48/0x2e4 Kernel panic - not syncing: Attempted to kill init! [bhelgaas: changelog, add "Reported:" and "Fixes:" tags] Reported: http://forum.doozan.com/read.php?2,17868,22070,quote=1 Fixes: 8c7d14746abc ("ARM/PCI: Move to generic PCI domains") Fixes: 7c674700098c ("PCI: Move domain assignment from arm64 to generic code") Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> CC: stable@vger.kernel.org # v4.0+
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Tip revision: 54c6e2dd00c313d0add58e5befe62fe6f286d03b authored by Krzysztof =?utf-8?Q?Ha=C5=82asa?= on 01 March 2016, 06:07:18 UTC
PCI: Allow a NULL "parent" pointer in pci_bus_assign_domain_nr()
PCI: Allow a NULL "parent" pointer in pci_bus_assign_domain_nr()
Tip revision: 54c6e2d
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