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net: inet: do not leave a dangling sk pointer in inet_create()

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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 <ignat@cloudflare.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20241014153808.51894-7-ignat@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ignat Korchagin 2024-10-14 16:38:05 +01:00 committed by Jakub Kicinski
parent b4fcd63f6e
commit 9365fa510c
1 changed files with 10 additions and 12 deletions
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22
net/ipv4/af_inet.c
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@ -376,32 +376,30 @@ 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;
}