linux-kernel - [PATCH] [POWERPC] mpc5200-fec: Fix possible NULL dereference in mdio driver

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Date:	Fri, 21 Mar 2008 21:20:29 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	linux-kernel@...r.kernel.org, paulus@...ba.org,
	linuxppc-dev@...abs.org
Cc:	Grant Likely <grant.likely@...retlab.ca>
Subject: [PATCH] [POWERPC] mpc5200-fec: Fix possible NULL dereference in mdio
 driver

If the reg property is missing from the phy node (unlikely, but possible),
then the kernel will oops with a NULL pointer dereference.

Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
---
This one is a bugfix that should go in for 2.6.25.  Paul, can you please
pick it up?

Thanks,
g.

 drivers/net/fec_mpc52xx_phy.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/net/fec_mpc52xx_phy.c b/drivers/net/fec_mpc52xx_phy.c
index 1837584..6a3ac4e 100644
--- a/drivers/net/fec_mpc52xx_phy.c
+++ b/drivers/net/fec_mpc52xx_phy.c
@@ -109,7 +109,8 @@ static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_i
 		int irq = irq_of_parse_and_map(child, 0);
 		if (irq != NO_IRQ) {
 			const u32 *id = of_get_property(child, "reg", NULL);
-			bus->irq[*id] = irq;
+			if (id)
+				bus->irq[*id] = irq;
 		}
 	}
 
-- 
1.5.4.3

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