]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
netlink: make sure nladdr has correct size in netlink_connect()
authorAlexander Potapenko <glider@google.com>
Fri, 23 Mar 2018 12:49:02 +0000 (13:49 +0100)
committerDavid S. Miller <davem@davemloft.net>
Mon, 26 Mar 2018 01:14:51 +0000 (21:14 -0400)
KMSAN reports use of uninitialized memory in the case when |alen| is
smaller than sizeof(struct sockaddr_nl), and therefore |nladdr| isn't
fully copied from the userspace.

Signed-off-by: Alexander Potapenko <glider@google.com>
Fixes: 1da177e4c3f41524 ("Linux-2.6.12-rc2")
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/netlink/af_netlink.c

index 07e8478068f0a1fafc0b41bb939ed508d40e3f21..70c455341243b2b8b8a3981cbf0fd904ebaaa624 100644 (file)
@@ -1085,6 +1085,9 @@ static int netlink_connect(struct socket *sock, struct sockaddr *addr,
        if (addr->sa_family != AF_NETLINK)
                return -EINVAL;
 
+       if (alen < sizeof(struct sockaddr_nl))
+               return -EINVAL;
+
        if ((nladdr->nl_groups || nladdr->nl_pid) &&
            !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
                return -EPERM;