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| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2025-04-22 17:16:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-02 07:50:46 +0200 |
| commit | 2f2803e4b5e4df2b08d378deaab78b1681ef9b30 (patch) | |
| tree | 116586e4e39bc27fe2ab488acbd96709520e8b04 /drivers/irqchip | |
| parent | 3d36fae38312d061279b42a3c2269ee372189bbc (diff) | |
| download | linux-2f2803e4b5e4df2b08d378deaab78b1681ef9b30.tar.gz linux-2f2803e4b5e4df2b08d378deaab78b1681ef9b30.tar.bz2 linux-2f2803e4b5e4df2b08d378deaab78b1681ef9b30.zip | |
irqchip/gic-v2m: Prevent use after free of gicv2m_get_fwnode()
commit 3318dc299b072a0511d6dfd8367f3304fb6d9827 upstream.
With ACPI in place, gicv2m_get_fwnode() is registered with the pci
subsystem as pci_msi_get_fwnode_cb(), which may get invoked at runtime
during a PCI host bridge probe. But, the call back is wrongly marked as
__init, causing it to be freed, while being registered with the PCI
subsystem and could trigger:
Unable to handle kernel paging request at virtual address ffff8000816c0400
gicv2m_get_fwnode+0x0/0x58 (P)
pci_set_bus_msi_domain+0x74/0x88
pci_register_host_bridge+0x194/0x548
This is easily reproducible on a Juno board with ACPI boot.
Retain the function for later use.
Fixes: 0644b3daca28 ("irqchip/gic-v2m: acpi: Introducing GICv2m ACPI support")
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v2m.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c index d83c2c85962c..683e8721e3b4 100644 --- a/drivers/irqchip/irq-gic-v2m.c +++ b/drivers/irqchip/irq-gic-v2m.c @@ -454,7 +454,7 @@ static int __init gicv2m_of_init(struct fwnode_handle *parent_handle, #ifdef CONFIG_ACPI static int acpi_num_msi; -static __init struct fwnode_handle *gicv2m_get_fwnode(struct device *dev) +static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev) { struct v2m_data *data; |