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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>,
	Florian Westphal <fw@strlen.de>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	netdev@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH net] netfilter: nf_conntrack_pptp: prevent buffer overflows in debug code
Date: Wed, 06 May 2020 10:17:53 +0000	[thread overview]
Message-ID: <20200506101753.GD77004@mwanda> (raw)

Smatch complains that the value for "cmd" comes from the network and
can't be trusted.  The value is actually checked at the end of these
functions so I just copied that here as well.

Fixes: f09943fefe6b ("[NETFILTER]: nf_conntrack/nf_nat: add PPTP helper port")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 net/netfilter/nf_conntrack_pptp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
index a971183f11af7..b4dc567f7fb68 100644
--- a/net/netfilter/nf_conntrack_pptp.c
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -276,7 +276,8 @@ pptp_inbound_pkt(struct sk_buff *skb, unsigned int protoff,
 	typeof(nf_nat_pptp_hook_inbound) nf_nat_pptp_inbound;
 
 	msg = ntohs(ctlh->messageType);
-	pr_debug("inbound control message %s\n", pptp_msg_name[msg]);
+	pr_debug("inbound control message %s\n",
+		 msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0]);
 
 	switch (msg) {
 	case PPTP_START_SESSION_REPLY:
@@ -404,7 +405,8 @@ pptp_outbound_pkt(struct sk_buff *skb, unsigned int protoff,
 	typeof(nf_nat_pptp_hook_outbound) nf_nat_pptp_outbound;
 
 	msg = ntohs(ctlh->messageType);
-	pr_debug("outbound control message %s\n", pptp_msg_name[msg]);
+	pr_debug("outbound control message %s\n",
+		 msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0]);
 
 	switch (msg) {
 	case PPTP_START_SESSION_REQUEST:
-- 
2.26.2

WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>,
	Florian Westphal <fw@strlen.de>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	netdev@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH net] netfilter: nf_conntrack_pptp: prevent buffer overflows in debug code
Date: Wed, 6 May 2020 13:17:53 +0300	[thread overview]
Message-ID: <20200506101753.GD77004@mwanda> (raw)

Smatch complains that the value for "cmd" comes from the network and
can't be trusted.  The value is actually checked at the end of these
functions so I just copied that here as well.

Fixes: f09943fefe6b ("[NETFILTER]: nf_conntrack/nf_nat: add PPTP helper port")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 net/netfilter/nf_conntrack_pptp.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
index a971183f11af7..b4dc567f7fb68 100644
--- a/net/netfilter/nf_conntrack_pptp.c
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -276,7 +276,8 @@ pptp_inbound_pkt(struct sk_buff *skb, unsigned int protoff,
 	typeof(nf_nat_pptp_hook_inbound) nf_nat_pptp_inbound;
 
 	msg = ntohs(ctlh->messageType);
-	pr_debug("inbound control message %s\n", pptp_msg_name[msg]);
+	pr_debug("inbound control message %s\n",
+		 msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0]);
 
 	switch (msg) {
 	case PPTP_START_SESSION_REPLY:
@@ -404,7 +405,8 @@ pptp_outbound_pkt(struct sk_buff *skb, unsigned int protoff,
 	typeof(nf_nat_pptp_hook_outbound) nf_nat_pptp_outbound;
 
 	msg = ntohs(ctlh->messageType);
-	pr_debug("outbound control message %s\n", pptp_msg_name[msg]);
+	pr_debug("outbound control message %s\n",
+		 msg <= PPTP_MSG_MAX ? pptp_msg_name[msg] : pptp_msg_name[0]);
 
 	switch (msg) {
 	case PPTP_START_SESSION_REQUEST:
-- 
2.26.2


             reply	other threads:[~2020-05-06 10:17 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-06 10:17 Dan Carpenter [this message]
2020-05-06 10:17 ` [PATCH net] netfilter: nf_conntrack_pptp: prevent buffer overflows in debug code Dan Carpenter
2020-05-10 21:46 ` Pablo Neira Ayuso
2020-05-10 21:46   ` Pablo Neira Ayuso

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