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ipv6: sr: fix missing sk_buff release in seg6_input_core

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[ Upstream commit 5447f9708d9e4c17a647b16a9cb29e9e02820bd9 ]

The seg6_input() function is responsible for adding the SRH into a
packet, delegating the operation to the seg6_input_core(). This function
uses the skb_cow_head() to ensure that there is sufficient headroom in
the sk_buff for accommodating the link-layer header.
In the event that the skb_cow_header() function fails, the
seg6_input_core() catches the error but it does not release the sk_buff,
which will result in a memory leak.

This issue was introduced in commit af3b5158b89d ("ipv6: sr: fix BUG due
to headroom too small after SRH push") and persists even after commit
7a3f5b0de364 ("netfilter: add netfilter hooks to SRv6 data plane"),
where the entire seg6_input() code was refactored to deal with netfilter
hooks.

The proposed patch addresses the identified memory leak by requiring the
seg6_input_core() function to release the sk_buff in the event that
skb_cow_head() fails.

Fixes: af3b5158b89d ("ipv6: sr: fix BUG due to headroom too small after SRH push")
Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Reviewed-by: Simon Horman <horms@kernel.org>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrea Mayer 2024-05-17 18:45:41 +02:00 committed by Greg Kroah-Hartman
parent c707bf57a8
commit e8688218e3
1 changed files with 6 additions and 5 deletions
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11
net/ipv6/seg6_iptunnel.c
View File

@ -327,10 +327,8 @@ static int seg6_input_core(struct net *net, struct sock *sk,
int err;
err = seg6_do_srh(skb);
if (unlikely(err)) {
kfree_skb(skb);
return err;
}
if (unlikely(err))
goto drop;
slwt = seg6_lwt_lwtunnel(orig_dst->lwtstate);
@ -355,7 +353,7 @@ static int seg6_input_core(struct net *net, struct sock *sk,
err = skb_cow_head(skb, LL_RESERVED_SPACE(dst->dev));
if (unlikely(err))
return err;
goto drop;
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
@ -363,6 +361,9 @@ static int seg6_input_core(struct net *net, struct sock *sk,
skb_dst(skb)->dev, seg6_input_finish);
return seg6_input_finish(dev_net(skb->dev), NULL, skb);
drop:
kfree_skb(skb);
return err;
}
static int seg6_input_nf(struct sk_buff *skb)