linux-kernel - [PATCH 4.9 19/86] MIPS: OCTEON: irq: Check for null return on kzalloc allocation

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Date:   Fri, 16 Mar 2018 16:22:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>,
        David Daney <david.daney@...ium.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "Steven J. Hill" <Steven.Hill@...ium.com>,
        linux-mips@...ux-mips.org, James Hogan <jhogan@...nel.org>
Subject: [PATCH 4.9 19/86] MIPS: OCTEON: irq: Check for null return on kzalloc allocation

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 902f4d067a50ccf645a58dd5fb1d113b6e0f9b5b upstream.

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>
Acked-by: David Daney <david.daney@...ium.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: "Steven J. Hill" <Steven.Hill@...ium.com>
Cc: linux-mips@...ux-mips.org
Cc: <stable@...r.kernel.org> # 4.0+
Patchwork: https://patchwork.linux-mips.org/patch/18658/
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/mips/cavium-octeon/octeon-irq.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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(st
 	}

 	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);