net: tulip: de4x5: fix the problem that the array 'lp->phy[8]' may be out of bound

[ Upstream commit 61217be886b5f7402843677e4be7e7e83de9cb41 ]

In line 5001, if all id in the array 'lp->phy[8]' is not 0, when the
'for' end, the 'k' is 8.

At this time, the array 'lp->phy[8]' may be out of bound.

Signed-off-by: zhangyue <zhangyue1@kylinos.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/dec/tulip/de4x5.c b/drivers/net/ethernet/dec/tulip/de4x5.c
index c813e6f2b371eb81ff006183ac94e678f2f9df8b..a80252973171f230db7a37295380dae8cfb86998 100644 (file)
--- a/drivers/net/ethernet/dec/tulip/de4x5.c
+++ b/drivers/net/ethernet/dec/tulip/de4x5.c
@@ -4999,19 +4999,23 @@ mii_get_phy(struct net_device *dev)
        }
        if ((j == limit) && (i < DE4X5_MAX_MII)) {
            for (k=0; k < DE4X5_MAX_PHY && lp->phy[k].id; k++);
-           lp->phy[k].addr = i;
-           lp->phy[k].id = id;
-           lp->phy[k].spd.reg = GENERIC_REG;      /* ANLPA register         */
-           lp->phy[k].spd.mask = GENERIC_MASK;    /* 100Mb/s technologies   */
-           lp->phy[k].spd.value = GENERIC_VALUE;  /* TX & T4, H/F Duplex    */
-           lp->mii_cnt++;
-           lp->active++;
-           printk("%s: Using generic MII device control. If the board doesn't operate,\nplease mail the following dump to the author:\n", dev->name);
-           j = de4x5_debug;
-           de4x5_debug |= DEBUG_MII;
-           de4x5_dbg_mii(dev, k);
-           de4x5_debug = j;
-           printk("\n");
+           if (k < DE4X5_MAX_PHY) {
+               lp->phy[k].addr = i;
+               lp->phy[k].id = id;
+               lp->phy[k].spd.reg = GENERIC_REG;      /* ANLPA register         */
+               lp->phy[k].spd.mask = GENERIC_MASK;    /* 100Mb/s technologies   */
+               lp->phy[k].spd.value = GENERIC_VALUE;  /* TX & T4, H/F Duplex    */
+               lp->mii_cnt++;
+               lp->active++;
+               printk("%s: Using generic MII device control. If the board doesn't operate,\nplease mail the following dump to the author:\n", dev->name);
+               j = de4x5_debug;
+               de4x5_debug |= DEBUG_MII;
+               de4x5_dbg_mii(dev, k);
+               de4x5_debug = j;
+               printk("\n");
+           } else {
+               goto purgatory;
+           }
        }
     }
   purgatory: