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net: esp: cleanup esp_output_tail_tcp() in case of unsupported ESPINTCP

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[ Upstream commit 96f887a612e4cda89efc3f54bc10c1997e3ab0e9 ]

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>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hagar Hemdan 2024-05-18 13:04:39 +00:00 • committed by Ksawlii
parent 91e4b0be6f
commit 520a2c2f7f
2 changed files with 2 additions and 4 deletions
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3
net/ipv4/esp4.c
View file

@ -239,8 +239,7 @@ 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

3
net/ipv6/esp6.c
View file

@ -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