From 1cf180c94e9166cda083ff65333883ab3648e852 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 28 Sep 2010 20:57:19 +0200 Subject: [PATCH] x86, irq: Plug memory leak in sparse irq free_irq_cfg() is not freeing the cpumask_vars in irq_cfg. Fixing this triggers a use after free caused by the fact that copying struct irq_cfg is done with memcpy, which copies the pointer not the cpumask. Fix both places. Signed-off-by: Thomas Gleixner Cc: Yinghai Lu LKML-Reference: Signed-off-by: Thomas Gleixner Cc: stable@kernel.org Signed-off-by: H. Peter Anvin --- arch/x86/kernel/apic/io_apic.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index f1efebaf5510..5c5b8f3dddb5 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -306,14 +306,19 @@ void arch_init_copy_chip_data(struct irq_desc *old_desc, old_cfg = old_desc->chip_data; - memcpy(cfg, old_cfg, sizeof(struct irq_cfg)); + cfg->vector = old_cfg->vector; + cfg->move_in_progress = old_cfg->move_in_progress; + cpumask_copy(cfg->domain, old_cfg->domain); + cpumask_copy(cfg->old_domain, old_cfg->old_domain); init_copy_irq_2_pin(old_cfg, cfg, node); } -static void free_irq_cfg(struct irq_cfg *old_cfg) +static void free_irq_cfg(struct irq_cfg *cfg) { - kfree(old_cfg); + free_cpumask_var(cfg->domain); + free_cpumask_var(cfg->old_domain); + kfree(cfg); } void arch_free_chip_data(struct irq_desc *old_desc, struct irq_desc *desc) -- 2.20.1