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authorDavide Caratti <dcaratti@redhat.com>2018-06-08 06:02:31 +0300
committerDavid S. Miller <davem@davemloft.net>2018-06-09 01:49:19 +0300
commit8d499533e0bc02d44283dbdab03142b599b8ba16 (patch)
treeeaf7ec1426a9c9625b43711b6578109f22358ffc /net
parent6310a882fbe0b87e0950222f2ac197ed92e11792 (diff)
downloadlinux-8d499533e0bc02d44283dbdab03142b599b8ba16.tar.xz
net/sched: act_simple: fix parsing of TCA_DEF_DATA
use nla_strlcpy() to avoid copying data beyond the length of TCA_DEF_DATA netlink attribute, in case it is less than SIMP_MAX_DATA and it does not end with '\0' character. v2: fix errors in the commit message, thanks Hangbin Liu Fixes: fa1b1cff3d06 ("net_cls_act: Make act_simple use of netlink policy.") Signed-off-by: Davide Caratti <dcaratti@redhat.com> Reviewed-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sched/act_simple.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 9618b4a83cee..98c4afe7c15b 100644
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -53,22 +53,22 @@ static void tcf_simp_release(struct tc_action *a)
kfree(d->tcfd_defdata);
}
-static int alloc_defdata(struct tcf_defact *d, char *defdata)
+static int alloc_defdata(struct tcf_defact *d, const struct nlattr *defdata)
{
d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
if (unlikely(!d->tcfd_defdata))
return -ENOMEM;
- strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
+ nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
return 0;
}
-static void reset_policy(struct tcf_defact *d, char *defdata,
+static void reset_policy(struct tcf_defact *d, const struct nlattr *defdata,
struct tc_defact *p)
{
spin_lock_bh(&d->tcf_lock);
d->tcf_action = p->action;
memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
- strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
+ nla_strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
spin_unlock_bh(&d->tcf_lock);
}
@@ -87,7 +87,6 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
struct tcf_defact *d;
bool exists = false;
int ret = 0, err;
- char *defdata;
if (nla == NULL)
return -EINVAL;
@@ -110,8 +109,6 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
return -EINVAL;
}
- defdata = nla_data(tb[TCA_DEF_DATA]);
-
if (!exists) {
ret = tcf_idr_create(tn, parm->index, est, a,
&act_simp_ops, bind, false);
@@ -119,7 +116,7 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
return ret;
d = to_defact(*a);
- ret = alloc_defdata(d, defdata);
+ ret = alloc_defdata(d, tb[TCA_DEF_DATA]);
if (ret < 0) {
tcf_idr_release(*a, bind);
return ret;
@@ -133,7 +130,7 @@ static int tcf_simp_init(struct net *net, struct nlattr *nla,
if (!ovr)
return -EEXIST;
- reset_policy(d, defdata, parm);
+ reset_policy(d, tb[TCA_DEF_DATA], parm);
}
if (ret == ACT_P_CREATED)