netdev - Re: [PATCH] fealnx: Write outside array bounds

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Date:	Sat, 25 Jul 2009 19:41:12 +0200
From:	Roel Kluin <roel.kluin@...il.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
CC:	"David S. Miller" <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] fealnx: Write outside array bounds

phy_idx is checked to be < 4, but np->phys[] is 2 elements long

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---

>> Or should the number of elements be increased?

>> -		for (phy = 1; phy < 32 && phy_idx < 4; phy++) {
>> +		for (phy = 1; phy < 32 && phy_idx < 2; phy++) {

> In either of the case, one should use ARRAY_SIZE(np->phys) instead of the 
> number.

Ah, yes.

diff --git a/drivers/net/fealnx.c b/drivers/net/fealnx.c
index 48385c4..160655d 100644
--- a/drivers/net/fealnx.c
+++ b/drivers/net/fealnx.c
@@ -584,7 +584,8 @@ static int __devinit fealnx_init_one(struct pci_dev *pdev,
 	if (np->flags == HAS_MII_XCVR) {
 		int phy, phy_idx = 0;
 
-		for (phy = 1; phy < 32 && phy_idx < 4; phy++) {
+		for (phy = 1; phy < 32 && phy_idx < ARRAY_SIZE(np->phys);
+			       phy++) {
 			int mii_status = mdio_read(dev, phy, 1);
 
 			if (mii_status != 0xffff && mii_status != 0x0000) {
--
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