Userland can send a netlink message requesting SOCK_DIAG_BY_FAMILY with a family greater or equal then AF_MAX -- the array size of sock_diag_handlers[]. The current code does not test for this condition therefore is vulnerable to an out-of-bound access opening doors for a privilege escalation. Signed-off-by: Mathias Krause --- net/core/sock_diag.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c index 602cd63..750f44f 100644 --- a/net/core/sock_diag.c +++ b/net/core/sock_diag.c @@ -121,6 +121,9 @@ static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (nlmsg_len(nlh) < sizeof(*req)) return -EINVAL; + if (req->sdiag_family >= AF_MAX) + return -EINVAL; + hndl = sock_diag_lock_handler(req->sdiag_family); if (hndl == NULL) err = -ENOENT; -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html