From: Hong Zhiguo <honkiko@gmail.com>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, stephen@networkplumber.org, tgraf@suug.ch
Subject: [PATCH v2 net-next] netlink: have length check of rtnl msg before deref
Date: Tue, 26 Mar 2013 11:36:33 +0800 [thread overview]
Message-ID: <1364268993-19947-1-git-send-email-honkiko@gmail.com> (raw)
In-Reply-To: <1364232143-16754-1-git-send-email-honkiko@gmail.com>
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@gmail.com>
---
net/sched/cls_api.c | 9 +++++----
net/sched/sch_api.c | 36 +++++++++++++++++++++---------------
2 files changed, 26 insertions(+), 19 deletions(-)
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 9a04b98..9d71d4d 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;
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 0bbce22..d7468ba 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;
@@ -985,14 +985,15 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
if ((n->nlmsg_type != RTM_GETQDISC) && !capable(CAP_NET_ADMIN))
return -EPERM;
- dev = __dev_get_by_index(net, tcm->tcm_ifindex);
- if (!dev)
- return -ENODEV;
-
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
if (err < 0)
return err;
+ dev = __dev_get_by_index(net, tcm->tcm_ifindex);
+ if (!dev)
+ return -ENODEV;
+
+ clid = tcm->tcm_parent;
if (clid) {
if (clid != TC_H_ROOT) {
if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) {
@@ -1053,6 +1054,10 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n)
replay:
/* Reinit, just in case something touches this. */
+ err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
+ if (err < 0)
+ return err;
+
tcm = nlmsg_data(n);
clid = tcm->tcm_parent;
q = p = NULL;
@@ -1061,9 +1066,6 @@ replay:
if (!dev)
return -ENODEV;
- err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
- if (err < 0)
- return err;
if (clid) {
if (clid != TC_H_ROOT) {
@@ -1382,22 +1384,22 @@ 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;
- dev = __dev_get_by_index(net, tcm->tcm_ifindex);
- if (!dev)
- return -ENODEV;
-
err = nlmsg_parse(n, sizeof(*tcm), tca, TCA_MAX, NULL);
if (err < 0)
return err;
+ dev = __dev_get_by_index(net, tcm->tcm_ifindex);
+ if (!dev)
+ return -ENODEV;
+
/*
parent == TC_H_UNSPEC - unspecified parent.
parent == TC_H_ROOT - class is root, which has no parent.
@@ -1413,6 +1415,10 @@ 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
next prev parent reply other threads:[~2013-03-26 3:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-25 17:22 [PATCH net-next] netlink: add missing length check of rtnl msg Hong Zhiguo
2013-03-25 17:54 ` David Miller
2013-03-25 23:12 ` Thomas Graf
2013-03-26 3:36 ` Hong Zhiguo [this message]
2013-03-26 8:59 ` [PATCH v2 net-next] netlink: have length check of rtnl msg before deref Thomas Graf
2013-03-26 16:36 ` David Miller
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