netdev - [PATCH] net: flow: Guard against accessing non-existent attributes

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Date:	Mon, 29 Dec 2014 11:17:35 +0900
From:	Simon Horman <simon.horman@...ronome.com>
To:	John Fastabend <john.r.fastabend@...el.com>, netdev@...r.kernel.org
Cc:	Simon Horman <simon.horman@...ronome.com>
Subject: [PATCH] net: flow: Guard against accessing non-existent attributes

Signed-off-by: Simon Horman <simon.horman@...ronome.com>
---
 net/core/flow_table.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/core/flow_table.c b/net/core/flow_table.c
index 5937fb7..df2adf6 100644
--- a/net/core/flow_table.c
+++ b/net/core/flow_table.c
@@ -480,6 +480,10 @@ static int net_flow_get_action(struct net_flow_action *a, struct nlattr *attr)
 	if (err < 0)
 		return err;
 
+	if (!act[NET_FLOW_ACTION_ATTR_UID] ||
+	    !act[NET_FLOW_ACTION_ATTR_SIGNATURE])
+		return -EINVAL;
+
 	a->uid = nla_get_u32(act[NET_FLOW_ACTION_ATTR_UID]);
 
 	nla_for_each_nested(args, act[NET_FLOW_ACTION_ATTR_SIGNATURE], rem)
@@ -513,6 +517,10 @@ static int net_flow_get_flow(struct net_flow_flow *flow, struct nlattr *attr)
 	if (err < 0)
 		return -EINVAL;
 
+	if (!f[NET_FLOW_ATTR_TABLE] || !f[NET_FLOW_ATTR_UID] ||
+	    !f[NET_FLOW_ATTR_PRIORITY])
+		return -EINVAL;
+
 	flow->table_id = nla_get_u32(f[NET_FLOW_ATTR_TABLE]);
 	flow->uid = nla_get_u32(f[NET_FLOW_ATTR_UID]);
 	flow->priority = nla_get_u32(f[NET_FLOW_ATTR_PRIORITY]);
@@ -1209,6 +1217,9 @@ static int net_flow_table_cmd_get_flows(struct sk_buff *skb,
 	if (err)
 		goto out;
 
+	if (!tb[NET_FLOW_TABLE_FLOWS_TABLE])
+		goto out;
+
 	table = nla_get_u32(tb[NET_FLOW_TABLE_FLOWS_TABLE]);
 
 	if (tb[NET_FLOW_TABLE_FLOWS_MINPRIO])
-- 
2.1.3

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