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From: Hagar Hemdan <hagarhem@amazon.com>
To:
CC: Norbert Manthey <nmanthey@amazon.de>, Hagar Hemdan <hagarhem@amazon.com>,
	Steffen Klassert <steffen.klassert@secunet.com>, Herbert Xu
	<herbert@gondor.apana.org.au>, "David S. Miller" <davem@davemloft.net>, David
 Ahern <dsahern@kernel.org>, Eric Dumazet <edumazet@google.com>, Jakub
 Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, "Sabrina
 Dubroca" <sd@queasysnail.net>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH v2] net: esp: cleanup esp_output_tail_tcp() in case of unsupported ESPINTCP
Date: Sat, 18 May 2024 13:04:39 +0000
Message-ID: <20240518130439.20374-1-hagarhem@amazon.com>
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xmit() functions should consume skb or return error codes in error
paths.
When the configuration "CONFIG_INET_ESPINTCP" is not set, the
implementation of the function "esp_output_tail_tcp" violates this rule.
The function frees the skb and returns the error code.
This change removes the kfree_skb from both functions, for both
esp4 and esp6.
WARN_ON is added because esp_output_tail_tcp() should never be called if
CONFIG_INET_ESPINTCP is not set.

This bug was discovered and resolved using Coverity Static Analysis
Security Testing (SAST) by Synopsys, Inc.

Fixes: e27cca96cd68 ("xfrm: add espintcp (RFC 8229)")
Signed-off-by: Hagar Hemdan <hagarhem@amazon.com>
---
 net/ipv4/esp4.c | 3 +--
 net/ipv6/esp6.c | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index d33d12421814..e73de3abe37c 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -238,8 +238,7 @@ static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 #else
 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 {
-	kfree_skb(skb);
-
+	WARN_ON(1);
 	return -EOPNOTSUPP;
 }
 #endif
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 7371886d4f9f..600402e54ccd 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -255,8 +255,7 @@ static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 #else
 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
 {
-	kfree_skb(skb);
-
+	WARN_ON(1);
 	return -EOPNOTSUPP;
 }
 #endif
-- 
2.40.1