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Subject[PATCH] irqchip/sunxi-nmi: fix error check of of_io_request_and_map()
Date
The of_io_request_and_map() returns a valid pointer in iomem region or
ERR_PTR(), check for NULL always fails and may cause a NULL pointer
dereference on error path.

Fixes: 0e841b04c829 ("irqchip/sunxi-nmi: Switch to of_io_request_and_map() from of_iomap()")
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
---
drivers/irqchip/irq-sunxi-nmi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-sunxi-nmi.c b/drivers/irqchip/irq-sunxi-nmi.c
index 0820f67..668730c 100644
--- a/drivers/irqchip/irq-sunxi-nmi.c
+++ b/drivers/irqchip/irq-sunxi-nmi.c
@@ -160,9 +160,9 @@ static int __init sunxi_sc_nmi_irq_init(struct device_node *node,

gc = irq_get_domain_generic_chip(domain, 0);
gc->reg_base = of_io_request_and_map(node, 0, of_node_full_name(node));
- if (!gc->reg_base) {
+ if (IS_ERR(gc->reg_base)) {
pr_err("unable to map resource\n");
- ret = -ENOMEM;
+ ret = PTR_ERR(gc->reg_base);
goto fail_irqd_remove;
}

--
2.1.4
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