linux-kernel - [PATCH 3.16.y-ckt 063/118] net: dsa: Test array index before use

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Message-Id: <1439369820-27005-64-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 12 Aug 2015 09:56:05 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 063/118] net: dsa: Test array index before use

3.16.7-ckt16 -stable review patch.  If anyone has any objections, please let me know.

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

From: Florian Fainelli <f.fainelli@...il.com>

commit 8f5063e97f393d49611151d3cf7dcbeb41397f12 upstream.

port_index is used an index into an array, and this information comes
from Device Tree, make sure that port_index is not equal to the array
size before using it. Move the check against port_index earlier in the
loop.

Fixes: 5e95329b701c: ("dsa: add device tree bindings to register DSA switches")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/dsa/dsa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 5db37cef50a9..d3ca32dc167f 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -427,6 +427,8 @@ static int dsa_of_probe(struct platform_device *pdev)
 				continue;
 
 			port_index = be32_to_cpup(port_reg);
+			if (port_index >= DSA_MAX_PORTS)
+				break;
 
 			port_name = of_get_property(port, "label", NULL);
 			if (!port_name)
@@ -449,8 +451,6 @@ static int dsa_of_probe(struct platform_device *pdev)
 					goto out_free_chip;
 			}
 
-			if (port_index == DSA_MAX_PORTS)
-				break;
 		}
 	}
 
--
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