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rtnetlink: allocate more memory for dev_set_mac_address()

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virtnet_set_mac_address() interprets mac address as struct
sockaddr, but upper layer only allocates dev->addr_len
which is ETH_ALEN + sizeof(sa_family_t) in this case.

We lack a unified definition for mac address, so just fix
the upper layer, this also allows drivers to interpret it
to struct sockaddr freely.

Reported-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
WANG Cong 2017-07-20 11:27:57 -07:00 committed by David S. Miller
parent be35e8c516
commit 153711f942
1 changed files with 2 additions and 1 deletions
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3
net/core/rtnetlink.c
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@ -2031,7 +2031,8 @@ static int do_setlink(const struct sk_buff *skb,
struct sockaddr *sa;
int len;
len = sizeof(sa_family_t) + dev->addr_len;
len = sizeof(sa_family_t) + max_t(size_t, dev->addr_len,
sizeof(*sa));
sa = kmalloc(len, GFP_KERNEL);
if (!sa) {
err = -ENOMEM;