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ibmvnic: Define vnic_login_client_data name field as unsized array

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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>
This commit is contained in:
Kees Cook 2018-04-10 15:26:43 -07:00 committed by David S. Miller
parent 5d1365940a
commit 08ea556e14
1 changed files with 6 additions and 6 deletions
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12
drivers/net/ethernet/ibm/ibmvnic.c
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@ -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)