ibmvnic: Define vnic_login_client_data name field as unsized array

The "name" field of struct vnic_login_client_data is a char array of
undefined length. This should be written as "char name[]" so the compiler
can make better decisions about the field (for example, not assuming
it's a single character). This was noticed while trying to tighten the
CONFIG_FORTIFY_SOURCE checking.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index aad5658..35fbb41 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -3170,7 +3170,7 @@ static int send_version_xchg(struct ibmvnic_adapter *adapter)
 struct vnic_login_client_data {
        u8      type;
        __be16  len;
-       char    name;
+       char    name[];
 } __packed;
 
 static int vnic_client_data_len(struct ibmvnic_adapter *adapter)
@@ -3199,21 +3199,21 @@ static void vnic_add_client_data(struct ibmvnic_adapter *adapter,
        vlcd->type = 1;
        len = strlen(os_name) + 1;
        vlcd->len = cpu_to_be16(len);
-       strncpy(&vlcd->name, os_name, len);
-       vlcd = (struct vnic_login_client_data *)((char *)&vlcd->name + len);
+       strncpy(vlcd->name, os_name, len);
+       vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
 
        /* Type 2 - LPAR name */
        vlcd->type = 2;
        len = strlen(utsname()->nodename) + 1;
        vlcd->len = cpu_to_be16(len);
-       strncpy(&vlcd->name, utsname()->nodename, len);
-       vlcd = (struct vnic_login_client_data *)((char *)&vlcd->name + len);
+       strncpy(vlcd->name, utsname()->nodename, len);
+       vlcd = (struct vnic_login_client_data *)(vlcd->name + len);
 
        /* Type 3 - device name */
        vlcd->type = 3;
        len = strlen(adapter->netdev->name) + 1;
        vlcd->len = cpu_to_be16(len);
-       strncpy(&vlcd->name, adapter->netdev->name, len);
+       strncpy(vlcd->name, adapter->netdev->name, len);
 }
 
 static int send_login(struct ibmvnic_adapter *adapter)