[PATCH net-next] netlink: add missing length check of rtnl msg
From: Hong Zhiguo <hidden>
Date: 2013-03-25 17:22:42
Subsystem:
networking [general], tc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jamal Hadi Salim, Jiri Pirko, Linus Torvalds
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 <redacted> --- net/sched/cls_api.c | 4 ++++ net/sched/sch_api.c | 22 ++++++++++++++++++---- 2 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 9a04b98..01bfa9c 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c@@ -141,6 +141,10 @@ static int tc_ctl_tfilter(struct sk_buff *skb, struct nlmsghdr *n) if ((n->nlmsg_type != RTM_GETTFILTER) && !capable(CAP_NET_ADMIN)) return -EPERM; + + if (nlmsg_len(n) < sizeof(*t)) + return -EINVAL; + replay: t = nlmsg_data(n); protocol = TC_H_MIN(t->tcm_info);
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 0bbce22..b30a988 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c@@ -977,7 +977,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) struct tcmsg *tcm = nlmsg_data(n); struct nlattr *tca[TCA_MAX + 1]; struct net_device *dev; - u32 clid = tcm->tcm_parent; + u32 clid; struct Qdisc *q = NULL; struct Qdisc *p = NULL; int err;
@@ -985,6 +985,9 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN)) return -EPERM; + if (nlmsg_len(n) < sizeof(*tcm)) + return -EINVAL; + dev = __dev_get_by_index(net, tcm->tcm_ifindex); if (!dev) return -ENODEV;
@@ -993,6 +996,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n) if (err < 0) return err; + clid = tcm->tcm_parent; if (clid) { if (clid != TC_H_ROOT) { if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
@@ -1051,6 +1055,9 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n) if (!capable(CAP_NET_ADMIN)) return -EPERM; + if (nlmsg_len(n) < sizeof(*tcm)) + return -EINVAL; + replay: /* Reinit, just in case something touches this. */ tcm = nlmsg_data(n);
@@ -1382,14 +1389,17 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) const struct Qdisc_class_ops *cops; unsigned long cl = 0; unsigned long new_cl; - u32 portid = tcm->tcm_parent; - u32 clid = tcm->tcm_handle; - u32 qid = TC_H_MAJ(clid); + u32 portid; + u32 clid; + u32 qid; int err; if ((n->nlmsg_type != RTM_GETTCLASS) && !capable(CAP_NET_ADMIN)) return -EPERM; + if (nlmsg_len(n) < sizeof(*tcm)) + return -EINVAL; + dev = __dev_get_by_index(net, tcm->tcm_ifindex); if (!dev) return -ENODEV;
@@ -1413,6 +1423,10 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n) /* Step 1. Determine qdisc handle X:0 */ + portid = tcm->tcm_parent; + clid = tcm->tcm_handle; + qid = TC_H_MAJ(clid); + if (portid != TC_H_ROOT) { u32 qid1 = TC_H_MAJ(portid);
--
1.7.10.4