diff options
| author | WANG Cong <xiyou.wangcong@gmail.com> | 2017-07-20 11:27:57 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-08-11 08:49:32 -0700 |
| commit | cda2bc91baf7b6849733145331726a1364f20512 (patch) | |
| tree | 60a762ee0d1ed3c68b99320b08c849ef8212c23b /net | |
| parent | 0c47f11bc4a5ddd37962b2ba5a4d53f6caeeaec1 (diff) | |
rtnetlink: allocate more memory for dev_set_mac_address()
[ Upstream commit 153711f9421be5dbc973dc57a4109dc9d54c89b1 ]
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/rtnetlink.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index 9c6fd7f83a4a..4d2629781e8b 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -1965,7 +1965,8 @@ 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; |