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Message-Id: <1364232143-16754-1-git-send-email-honkiko@gmail.com>
Date: Tue, 26 Mar 2013 01:22:23 +0800
From: Hong Zhiguo <honkiko@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, stephen@...workplumber.org, tgraf@...g.ch,
Hong Zhiguo <honkiko@...il.com>
Subject: [PATCH net-next] netlink: add missing length check of rtnl msg
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 <honkiko@...il.com>
---
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
--
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