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authorRoss Lagerwall <ross.lagerwall@citrix.com>2019-01-14 09:16:56 +0000
committerDavid S. Miller <davem@davemloft.net>2019-01-16 13:35:21 -0800
commit04a4af334b971814eedf4e4a413343ad3287d9a9 (patch)
treedc4196a9e798d5f2bc2ebbeddb9b80717882687a /net/openvswitch
parent9098f21f4cc0f13bc0caa747590e53479c267405 (diff)
openvswitch: Avoid OOB read when parsing flow nlattrs
For nested and variable attributes, the expected length of an attribute is not known and marked by a negative number. This results in an OOB read when the expected length is later used to check if the attribute is all zeros. Fix this by using the actual length of the attribute rather than the expected length. Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/openvswitch')
-rw-r--r--net/openvswitch/flow_netlink.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 435a4bdf8f89..691da853bef5 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -500,7 +500,7 @@ static int __parse_flow_nlattrs(const struct nlattr *attr,
return -EINVAL;
}
- if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
+ if (!nz || !is_all_zero(nla_data(nla), nla_len(nla))) {
attrs |= 1 << type;
a[type] = nla;
}