e100, e1000, ixgb: Fix an impossible memory overwrite bug

We keep getting requests from people that think that this might be
an exploitable hole where we would overwrite 4 bytes in the netdev
struct if the pci name would exceed 15 characters. In reality this
will never happen but we fix it anyway.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>

3 files changed, 3 insertions, 3 deletions

diff --git a/drivers/net/e100.c b/drivers/net/e100.c
index d9750e269a56..ab0868cb120c 100644
--- a/drivers/net/e100.c
+++ b/drivers/net/e100.c
@@ -2572,7 +2572,7 @@ static int __devinit e100_probe(struct pci_dev *pdev,
 #ifdef CONFIG_NET_POLL_CONTROLLER
         netdev->poll_controller = e100_netpoll;
 #endif
-        strcpy(netdev->name, pci_name(pdev));
+        strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 
         nic = netdev_priv(netdev);
         nic->netdev = netdev;
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 082c02918a41..bd673802e8ce 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -759,7 +759,7 @@ e1000_probe(struct pci_dev *pdev,
 #ifdef CONFIG_NET_POLL_CONTROLLER
         netdev->poll_controller = e1000_netpoll;
 #endif
-        strcpy(netdev->name, pci_name(pdev));
+        strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
 
         netdev->mem_start = mmio_start;
         netdev->mem_end = mmio_start + mmio_len;
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index a88c2b8b66b1..fb4c1ad745b2 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -437,7 +437,7 @@ ixgb_probe(struct pci_dev *pdev,
         netdev->poll_controller = ixgb_netpoll;
 #endif
 
-        strcpy(netdev->name, pci_name(pdev));
+        strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
         netdev->mem_start = mmio_start;
         netdev->mem_end = mmio_start + mmio_len;
         netdev->base_addr = adapter->hw.io_base;