[PATCH] ibmvnic: Define vnic_login_client_data name field as unsized array

[Kees Cook]

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 <keesc...@chromium.org>
---
 drivers/net/ethernet/ibm/ibmvnic.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c 
b/drivers/net/ethernet/ibm/ibmvnic.c
index aad5658d79d5..35fbb41cd2d4 100644
--- 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)
-- 
2.7.4


-- 
Kees Cook
Pixel Security