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| author | Liping Zhang <zlpnobody@gmail.com> | 2017-07-23 17:52:23 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-24 16:25:06 -0700 |
| commit | 69ec932e364b1ba9c3a2085fe96b76c8a3f71e7c (patch) | |
| tree | 4adb13e0bebc06b4c9040ffa15ebc9421ca615a7 /net | |
| parent | 9476d393667968b4a02afbe9d35a3558482b943e (diff) | |
| download | linux-69ec932e364b1ba9c3a2085fe96b76c8a3f71e7c.tar.bz2 | |
openvswitch: fix potential out of bound access in parse_ct
Before the 'type' is validated, we shouldn't use it to fetch the
ovs_ct_attr_lens's minlen and maxlen, else, out of bound access
may happen.
Fixes: 7f8a436eaa2c ("openvswitch: Add conntrack action")
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/openvswitch/conntrack.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c index e3c4c6c3fef7..03859e386b47 100644 --- a/net/openvswitch/conntrack.c +++ b/net/openvswitch/conntrack.c @@ -1310,8 +1310,8 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, nla_for_each_nested(a, attr, rem) { int type = nla_type(a); - int maxlen = ovs_ct_attr_lens[type].maxlen; - int minlen = ovs_ct_attr_lens[type].minlen; + int maxlen; + int minlen; if (type > OVS_CT_ATTR_MAX) { OVS_NLERR(log, @@ -1319,6 +1319,9 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info, type, OVS_CT_ATTR_MAX); return -EINVAL; } + + maxlen = ovs_ct_attr_lens[type].maxlen; + minlen = ovs_ct_attr_lens[type].minlen; if (nla_len(a) < minlen || nla_len(a) > maxlen) { OVS_NLERR(log, "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)", |