Function free_ioapic_saved_registers() should mark ioapic->saved_regiters
as NULL after the memory has been freed. Otherwise when hot-adding
another IOAPIC, function alloc_ioapic_saved_registers() may reuse the
stale pointer and cause memory corruption.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
---
arch/x86/kernel/apic/io_apic.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index da02320..7412eb8 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -362,6 +362,7 @@ static void alloc_ioapic_saved_registers(int idx)
static void free_ioapic_saved_registers(int idx)
{
kfree(ioapics[idx].saved_registers);
+ ioapics[idx].saved_registers = NULL;
}
int __init arch_early_irq_init(void)
--
1.7.5.4
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