[PATCH AUTOSEL 6.12 044/107] net: inet6: do not leave a dangling sk pointer in inet6_create()
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REVIEWED: 2 (0M)
From: Sasha Levin <sashal@kernel.org>
Date: 2024-11-24 13:35:27
Also in:
lkml, stable
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
2 review trailers.
From: Ignat Korchagin <redacted> [ Upstream commit 9df99c395d0f55fb444ef39f4d6f194ca437d884 ] sock_init_data() attaches the allocated sk pointer to the provided sock object. If inet6_create() fails later, the sk object is released, but the sock object retains the dangling sk pointer, which may cause use-after-free later. Clear the sock sk pointer on error. Signed-off-by: Ignat Korchagin <redacted> Reviewed-by: Kuniyuki Iwashima <redacted> Reviewed-by: Eric Dumazet <redacted> Link: https://patch.msgid.link/20241014153808.51894-8-ignat@cloudflare.com (local) Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/ipv6/af_inet6.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index ba69b86f1c7d5..f60ec8b0f8ea4 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c@@ -252,31 +252,29 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol, */ inet->inet_sport = htons(inet->inet_num); err = sk->sk_prot->hash(sk); - if (err) { - sk_common_release(sk); - goto out; - } + if (err) + goto out_sk_release; } if (sk->sk_prot->init) { err = sk->sk_prot->init(sk); - if (err) { - sk_common_release(sk); - goto out; - } + if (err) + goto out_sk_release; } if (!kern) { err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk); - if (err) { - sk_common_release(sk); - goto out; - } + if (err) + goto out_sk_release; } out: return err; out_rcu_unlock: rcu_read_unlock(); goto out; +out_sk_release: + sk_common_release(sk); + sock->sk = NULL; + goto out; } static int __inet6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
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2.43.0