[PATCH] 3c59x: bounds checking for hw_checksums

Add bounds checking to usage of hw_checksums module parameter array.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
index e1f773d07edb..78f90eb02b9c 100644
--- a/drivers/net/3c59x.c
+++ b/drivers/net/3c59x.c
@@ -1513,9 +1513,10 @@ static int __devinit vortex_probe1(struct device *gendev,
                 dev->hard_start_xmit = boomerang_start_xmit;
                 /* Actually, it still should work with iommu. */
                 dev->features |= NETIF_F_SG;
-                if (((hw_checksums[card_idx] == -1) && (vp->drv_flags & HAS_HWCKSM)) ||
-                                        (hw_checksums[card_idx] == 1)) {
-                                dev->features |= NETIF_F_IP_CSUM;
+                if (card_idx < MAX_UNITS &&
+                    ((hw_checksums[card_idx] == -1 && (vp->drv_flags & HAS_HWCKSM)) ||
+                                hw_checksums[card_idx] == 1)) {
+                        dev->features |= NETIF_F_IP_CSUM;
                 }
         } else {
                 dev->hard_start_xmit = vortex_start_xmit;
@@ -2791,10 +2792,11 @@ vortex_close(struct net_device *dev)
         }
 
 #if DO_ZEROCOPY
-        if (    vp->rx_csumhits &&
-                        ((vp->drv_flags & HAS_HWCKSM) == 0) &&
-                        (hw_checksums[vp->card_idx] == -1)) {
-                printk(KERN_WARNING "%s supports hardware checksums, and we're not using them!\n", dev->name);
+        if (vp->rx_csumhits &&
+            (vp->drv_flags & HAS_HWCKSM) == 0 &&
+            (vp->card_idx >= MAX_UNITS || hw_checksums[vp->card_idx] == -1)) {
+                        printk(KERN_WARNING "%s supports hardware checksums, and we're "
+                                                "not using them!\n", dev->name);
         }
 #endif