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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Subject: [PATCH 4.19 075/146] MIPS: OCTEON: irq: Fix potential NULL pointer dereference
Date:   Thu, 16 Apr 2020 15:23:36 +0200
Message-Id: <20200416131253.199088941@linuxfoundation.org>
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From: Gustavo A. R. Silva <gustavo@embeddedor.com>

commit 792a402c2840054533ef56279c212ef6da87d811 upstream.

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@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/mips/cavium-octeon/octeon-irq.c |    3 +++
 1 file changed, 3 insertions(+)

--- 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
 	}
 
 	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
+	if (!cd)
+		return -ENOMEM;
+
 	cd->host_data = host_data;
 	cd->bit = hw;