linux-kernel - [PATCH] MIPS: OCTEON: irq: Fix potential NULL pointer dereference

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Date:   Tue, 22 Jan 2019 14:18:42 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     David Daney <david.daney@...ium.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] MIPS: OCTEON: irq: Fix potential NULL pointer dereference

There is a potential NULL pointer dereference in case kzalloc()
fails and returns NULL.

Fix this by adding a NULL check on *cd*

This bug was detected with the help of Coccinelle.

Fixes: 64b139f97c01 ("MIPS: OCTEON: irq: add CIB and other fixes")
Cc: stable@...r.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 arch/mips/cavium-octeon/octeon-irq.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index f97be32bf699..3ad1f76c063a 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -2199,6 +2199,9 @@ static int octeon_irq_cib_map(struct irq_domain *d,
 	}
 
 	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
+	if (!cd)
+		return -ENOMEM;
+
 	cd->host_data = host_data;
 	cd->bit = hw;
 
-- 
2.20.1