From cfe199afefe6201e998ddc07102fc1fdb55f196c Mon Sep 17 00:00:00 2001 From: Vladimir Zapolskiy Date: Wed, 9 Mar 2016 03:21:29 +0200 Subject: [PATCH] irqchip/sunxi-nmi: Fix error check of of_io_request_and_map() 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 Cc: Jason Cooper Cc: Marc Zyngier Cc: Chen-Yu Tsai Cc: Maxime Ripard Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1457486489-10189-1-git-send-email-vz@mleia.com Signed-off-by: Thomas Gleixner --- 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 0820f67cc9a7..668730c5cb66 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; } -- 2.20.1