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irqchip/gic-v5: Check get_logical_index() return value in MADT IAFFID parsing

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In gic_acpi_parse_iaffid() a given MADT GICC entry might not correspond
to a logical cpu recognized by the kernel, resulting in the cpu variable
initialization to an error value.

Currently, the get_logical_index() return value is not checked for failure,
which might result in out-of-bounds memory corruption while trying to
index a per_cpu variable array.

Add a check to evaluate get_logical_index() return value.

Fixes: 35866efa52 ("irqchip/gic-v5: Add ACPI IRS probing")
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://sashiko.dev/#/message/20260810104747.E5CE71F000E9%40smtp.kernel.org
Link: https://patch.msgid.link/20260812-gicv5-7-2-fixes-v1-1-3743e82c69a4@kernel.org
This commit is contained in:
Lorenzo Pieralisi 2026-08-12 11:10:29 +02:00 committed by Thomas Gleixner
parent ac6db0e0be
commit 328affc639
1 changed files with 2 additions and 0 deletions
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2
drivers/irqchip/irq-gic-v5-irs.c
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@ -874,6 +874,8 @@ static int __init gic_acpi_parse_iaffid(union acpi_subtable_headers *header,
return 0;
cpu = get_logical_index(gicc->arm_mpidr);
if (cpu < 0)
return 0;
if (gicc->iaffid & ~GENMASK(current_iaffid_bits - 1, 0)) {
pr_warn("CPU %d iaffid 0x%x exceeds IRS iaffid bits\n", cpu, gicc->iaffid);