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s6gmac: Read buffer overflow

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Check whether index is within bounds before testing the element.
In the last iteration i is PHY_MAX_ADDR. the condition
`!(p = pd->mii.bus->phy_map[PHY_MAX_ADDR])' is undefined and may
evaluate to false, which leads to a dereference of this invalid
phy_map in the phy_connect() below.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
roel kluin 2009-08-01 20:20:13 +00:00 committed by David S. Miller
parent 1b994b5a1b
commit 54706d9905
1 changed files with 1 additions and 1 deletions
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2
drivers/net/s6gmac.c
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@ -793,7 +793,7 @@ static inline int s6gmac_phy_start(struct net_device *dev)
struct s6gmac *pd = netdev_priv(dev);
int i = 0;
struct phy_device *p = NULL;
while ((!(p = pd->mii.bus->phy_map[i])) && (i < PHY_MAX_ADDR))
while ((i < PHY_MAX_ADDR) && (!(p = pd->mii.bus->phy_map[i])))
i++;
p = phy_connect(dev, dev_name(&p->dev), &s6gmac_adjust_link, 0,
PHY_INTERFACE_MODE_RGMII);