[PATCH AUTOSEL 6.1 20/48] net: inet: do not leave a dangling sk pointer in inet_create()
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REVIEWED: 2 (0M)
From: Sasha Levin <sashal@kernel.org>
Date: 2024-11-24 13:50:31
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 9365fa510c6f82e3aa550a09d0c5c6b44dbc78ff ] sock_init_data() attaches the allocated sk object to the provided sock object. If inet_create() fails later, the sk object is freed, but the sock object retains the dangling pointer, which may create use-after-free later. Clear the sk pointer in the sock object on error. Signed-off-by: Ignat Korchagin <redacted> Reviewed-by: Kuniyuki Iwashima <redacted> Reviewed-by: Eric Dumazet <redacted> Link: https://patch.msgid.link/20241014153808.51894-7-ignat@cloudflare.com (local) Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/ipv4/af_inet.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-)
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index cc013be9b02c4..4f3c932e37ed5 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c@@ -371,32 +371,30 @@ static int inet_create(struct net *net, struct socket *sock, int protocol, inet->inet_sport = htons(inet->inet_num); /* Add to protocol hash chains. */ 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; }
--
2.43.0