From de179c8c12e9e5a292269fa59e7c26ca797dc7bf Mon Sep 17 00:00:00 2001 From: Hong zhi guo Date: Mon, 25 Mar 2013 17:36:33 +0000 Subject: netlink: have length check of rtnl msg before deref When the legacy array rtm_min still exists, the length check within these functions is covered by rtm_min[RTM_NEWTFILTER], rtm_min[RTM_NEWQDISC] and rtm_min[RTM_NEWTCLASS]. But after Thomas Graf removed rtm_min several days ago, these checks are missing. Other doit functions should be OK. Signed-off-by: Hong Zhiguo Acked-by: Thomas Graf Signed-off-by: David S. Miller --- net/sched/cls_api.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'net/sched/cls_api.c') diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c index 9a04b981bc13..9d71d4ded53b 100644 --- a/net/sched/cls_api.c +++ b/net/sched/cls_api.c @@ -141,7 +141,12 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n) if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN)) return -EPERM; + replay: + err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); + if (err < 0) + return err; + t = nlmsg_data(n); protocol = TC_H_MIN(t->tcm_info); prio = TC_H_MAJ(t->tcm_info); @@ -164,10 +169,6 @@ replay: if (dev == NULL) return -ENODEV; - err = nlmsg_parse(n, sizeof(*t), tca, TCA_MAX, NULL); - if (err < 0) - return err; - /* Find qdisc */ if (!parent) { q = dev->qdisc; -- cgit v1.2.3