From cf813077018cdf5137da29f00b8a201f5d0f6990 Mon Sep 17 00:00:00 2001 From: Anmol Jain Date: Thu, 7 Aug 2025 17:48:31 +0000 Subject: [PATCH] net: inet: do not leave a dangling sk pointer in inet_create() jira VULN-41185 cve CVE-2024-56601 commit-author Ignat Korchagin 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 Reviewed-by: Kuniyuki Iwashima Reviewed-by: Eric Dumazet Link: https://patch.msgid.link/20241014153808.51894-7-ignat@cloudflare.com Signed-off-by: Jakub Kicinski (cherry picked from commit 9365fa510c6f82e3aa550a09d0c5c6b44dbc78ff) Signed-off-by: Anmol Jain --- 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 ef59a735f6314..cc3ccfbcaf2d1 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -367,32 +367,30 @@ 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; }