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macvlan: code refine to check data before using 

This patch checks data first at one place, return if it's null.

Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zhang Shengju 2017-09-20 08:12:23 +08:00 committed by David S. Miller
parent d4e1b299ec
commit 07850a4f74
1 changed files with 8 additions and 5 deletions
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13
drivers/net/macvlan.c
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@ -1231,11 +1231,14 @@ static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
return -EADDRNOTAVAIL;
}
if (data && data[IFLA_MACVLAN_FLAGS] &&
if (!data)
return 0;
if (data[IFLA_MACVLAN_FLAGS] &&
nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
return -EINVAL;
if (data && data[IFLA_MACVLAN_MODE]) {
if (data[IFLA_MACVLAN_MODE]) {
switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
case MACVLAN_MODE_PRIVATE:
case MACVLAN_MODE_VEPA:
@ -1248,7 +1251,7 @@ static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
}
}
if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
if (data[IFLA_MACVLAN_MACADDR_MODE]) {
switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
case MACVLAN_MACADDR_ADD:
case MACVLAN_MACADDR_DEL:
@ -1260,7 +1263,7 @@ static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
}
}
if (data && data[IFLA_MACVLAN_MACADDR]) {
if (data[IFLA_MACVLAN_MACADDR]) {
if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
return -EINVAL;
@ -1268,7 +1271,7 @@ static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
return -EADDRNOTAVAIL;
}
if (data && data[IFLA_MACVLAN_MACADDR_COUNT])
if (data[IFLA_MACVLAN_MACADDR_COUNT])
return -EINVAL;
return 0;