提交 1cf180c9 编写于 作者: T Thomas Gleixner 提交者: H. Peter Anvin

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: NThomas Gleixner <tglx@linutronix.de>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
LKML-Reference: <alpine.LFD.2.00.1009282052570.2416@localhost6.localdomain6>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: stable@kernel.org
Signed-off-by: NH. Peter Anvin <hpa@linux.intel.com>
上级 d900329e
......@@ -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)
......
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