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af_unix: Clean up error paths in unix_stream_sendmsg().

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If we move send_sig() to the SEND_SHUTDOWN check before
the while loop, then we can reuse the same kfree_skb()
after the pipe_err_free label.

Let's gather the scattered kfree_skb()s in error paths.

While at it, some style issues are fixed, and the pipe_err_free
label is renamed to out_pipe to match other label names.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kuniyuki Iwashima 2024-12-13 20:08:42 +09:00 • committed by Paolo Abeni
parent 6c444255b1
commit d460b04bc4
1 changed files with 20 additions and 19 deletions
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39
net/unix/af_unix.c
View file

@ -2275,8 +2275,13 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
} }
} }
if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) if (READ_ONCE(sk->sk_shutdown) & SEND_SHUTDOWN) {
goto pipe_err; if (!(msg->msg_flags & MSG_NOSIGNAL))
send_sig(SIGPIPE, current, 0);
err = -EPIPE;
goto out_err;
}
while (sent < len) { while (sent < len) {
size = len - sent; size = len - sent;
@ -2305,20 +2310,18 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
/* Only send the fds in the first buffer */ /* Only send the fds in the first buffer */
err = unix_scm_to_skb(&scm, skb, !fds_sent); err = unix_scm_to_skb(&scm, skb, !fds_sent);
if (err < 0) { if (err < 0)
kfree_skb(skb); goto out_free;
goto out_err;
}
fds_sent = true; fds_sent = true;
if (unlikely(msg->msg_flags & MSG_SPLICE_PAGES)) { if (unlikely(msg->msg_flags & MSG_SPLICE_PAGES)) {
skb->ip_summed = CHECKSUM_UNNECESSARY; skb->ip_summed = CHECKSUM_UNNECESSARY;
err = skb_splice_from_iter(skb, &msg->msg_iter, size, err = skb_splice_from_iter(skb, &msg->msg_iter, size,
sk->sk_allocation); sk->sk_allocation);
if (err < 0) { if (err < 0)
kfree_skb(skb); goto out_free;
goto out_err;
}
size = err; size = err;
refcount_add(size, &sk->sk_wmem_alloc); refcount_add(size, &sk->sk_wmem_alloc);
} else { } else {
@ -2326,17 +2329,15 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
skb->data_len = data_len; skb->data_len = data_len;
skb->len = size; skb->len = size;
err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size); err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size);
if (err) { if (err)
kfree_skb(skb); goto out_free;
goto out_err;
}
} }
unix_state_lock(other); unix_state_lock(other);
if (sock_flag(other, SOCK_DEAD) || if (sock_flag(other, SOCK_DEAD) ||
(other->sk_shutdown & RCV_SHUTDOWN)) (other->sk_shutdown & RCV_SHUTDOWN))
goto pipe_err_free; goto out_pipe;
maybe_add_creds(skb, sock, other); maybe_add_creds(skb, sock, other);
scm_stat_add(other, skb); scm_stat_add(other, skb);
@ -2359,13 +2360,13 @@ static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg,
return sent; return sent;
pipe_err_free: out_pipe:
unix_state_unlock(other); unix_state_unlock(other);
kfree_skb(skb); if (!sent && !(msg->msg_flags & MSG_NOSIGNAL))
pipe_err:
if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL))
send_sig(SIGPIPE, current, 0); send_sig(SIGPIPE, current, 0);
err = -EPIPE; err = -EPIPE;
out_free:
kfree_skb(skb);
out_err: out_err:
scm_destroy(&scm); scm_destroy(&scm);
return sent ? : err; return sent ? : err;