linux-kernel - [PATCH] MIPS: OCTEON: irq: check for null return on kzalloc allocation

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Date:   Thu, 22 Feb 2018 18:08:53 +0000
From:   Colin King <colin.king@...onical.com>
To:     Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        "Steven J . Hill" <Steven.Hill@...ium.com>,
        David Daney <david.daney@...ium.com>, linux-mips@...ux-mips.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] MIPS: OCTEON: irq: check for null return on kzalloc allocation

From: Colin Ian King <colin.king@...onical.com>

The allocation of host_data is not null checked, leading to a
null pointer dereference if the allocation fails. Fix this by
adding a null check and return with -ENOMEM.

Fixes: 64b139f97c01 ("MIPS: OCTEON: irq: add CIB and other fixes")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/mips/cavium-octeon/octeon-irq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index b993d9f2c9b9..203e1d2a56d5 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -2277,6 +2277,8 @@ static int __init octeon_irq_init_cib(struct device_node *ciu_node,
 	}
 
 	host_data = kzalloc(sizeof(*host_data), GFP_KERNEL);
+	if (!host_data)
+		return -ENOMEM;
 	raw_spin_lock_init(&host_data->lock);
 
 	addr = of_get_address(ciu_node, 0, NULL, NULL);
-- 
2.15.1