linux-kernel - [PATCH 3.19.y-ckt 104/107] net: dsa: Fix off-by-one in switch address parsing

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Message-Id: <1438811379-384-105-git-send-email-kamal@canonical.com>
Date:	Wed,  5 Aug 2015 14:49:36 -0700
From:	Kamal Mostafa <kamal@...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>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 104/107] net: dsa: Fix off-by-one in switch address parsing

3.19.8-ckt5 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit c8cf89f73f3d9ecbdea479778f0ac714be79be33 upstream.

cd->sw_addr is used as a MDIO bus address, which cannot exceed
PHY_MAX_ADDR (32), our check was off-by-one.

Fixes: 5e95329b701c ("dsa: add device tree bindings to register DSA switches")
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/dsa/dsa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dsa/dsa.c b/net/dsa/dsa.c
index 3731714..ed1bcee 100644
--- a/net/dsa/dsa.c
+++ b/net/dsa/dsa.c
@@ -627,7 +627,7 @@ static int dsa_of_probe(struct platform_device *pdev)
 			continue;
 
 		cd->sw_addr = be32_to_cpup(sw_addr);
-		if (cd->sw_addr > PHY_MAX_ADDR)
+		if (cd->sw_addr >= PHY_MAX_ADDR)
 			continue;
 
 		if (!of_property_read_u32(np, "eeprom-length", &eeprom_len))
-- 
1.9.1

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