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irqchip/renesas-rza1: Prevent use-after-free in rza1_irqc_probe() 

The gic_node is still being used in the rza1_irqc_parse_map() call
after the of_node_put() call, which may result in use-after-free.

Fixes: a644ccb819 ("irqchip: Add Renesas RZ/A1 Interrupt Controller driver")
Signed-off-by: Wen Yang <wen.yang99@zte.com.cn>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lkml.kernel.org/r/1562566745-7447-3-git-send-email-wen.yang99@zte.com.cn
This commit is contained in:
Wen Yang 2019-07-08 14:19:04 +08:00 committed by Thomas Gleixner
parent 222a21d295
commit 7c8e90ddf0
1 changed files with 8 additions and 7 deletions
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15
drivers/irqchip/irq-renesas-rza1.c
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@ -208,20 +208,19 @@ static int rza1_irqc_probe(struct platform_device *pdev)
return PTR_ERR(priv->base);
gic_node = of_irq_find_parent(np);
if (gic_node) {
if (gic_node)
parent = irq_find_host(gic_node);
of_node_put(gic_node);
}
if (!parent) {
dev_err(dev, "cannot find parent domain\n");
return -ENODEV;
ret = -ENODEV;
goto out_put_node;
}
ret = rza1_irqc_parse_map(priv, gic_node);
if (ret) {
dev_err(dev, "cannot parse %s: %d\n", "interrupt-map", ret);
return ret;
goto out_put_node;
}
priv->chip.name = "rza1-irqc",
@ -237,10 +236,12 @@ static int rza1_irqc_probe(struct platform_device *pdev)
priv);
if (!priv->irq_domain) {
dev_err(dev, "cannot initialize irq domain\n");
return -ENOMEM;
ret = -ENOMEM;
}
return 0;
out_put_node:
of_node_put(gic_node);
return ret;
}
static int rza1_irqc_remove(struct platform_device *pdev)