From mboxrd@z Thu Jan 1 00:00:00 1970 From: gregkh@linuxfoundation.org (Greg Kroah-Hartman) Date: Mon, 2 May 2016 17:12:20 -0700 Subject: [PATCH 4.5 141/200] irqchip/mxs: Fix error check of of_io_request_and_map() In-Reply-To: <20160503000554.631204776@linuxfoundation.org> References: <20160503000554.631204776@linuxfoundation.org> Message-ID: <20160503000559.246766070@linuxfoundation.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 4.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vladimir Zapolskiy commit edf8fcdc6b254236be005851af35ea5e826e7e09 upstream. 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: 25e34b44313b ("irqchip/mxs: Prepare driver for hardware with different offsets") Signed-off-by: Vladimir Zapolskiy Cc: Jason Cooper Cc: Marc Zyngier Cc: Oleksij Rempel Cc: Sascha Hauer Cc: Shawn Guo Cc: linux-arm-kernel at lists.infradead.org Link: http://lkml.kernel.org/r/1457486500-10237-1-git-send-email-vz at mleia.com Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- drivers/irqchip/irq-mxs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/irqchip/irq-mxs.c +++ b/drivers/irqchip/irq-mxs.c @@ -183,7 +183,7 @@ static void __iomem * __init icoll_init_ void __iomem *icoll_base; icoll_base = of_io_request_and_map(np, 0, np->name); - if (!icoll_base) + if (IS_ERR(icoll_base)) panic("%s: unable to map resource", np->full_name); return icoll_base; }