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unix_bind_bsd(): unlink if we fail after successful mknod

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We can do that more or less safely, since the parent is
held locked all along.  Yes, somebody might observe the
object via dcache, only to have it disappear afterwards,
but there's really no good way to prevent that.  It won't
race with other bind(2) or attempts to move the sucker
elsewhere, or put something else in its place - locked
parent prevents that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Al Viro 2021-06-19 03:50:32 +00:00 • committed by David S. Miller
parent 56c1731b28
commit c0c3b8d380
1 changed files with 16 additions and 13 deletions
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29
net/unix/af_unix.c
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@ -1010,20 +1010,13 @@ static int unix_bind_bsd(struct sock *sk, struct unix_address *addr)
err = security_path_mknod(&parent, dentry, mode, 0);
if (!err)
err = vfs_mknod(ns, d_inode(parent.dentry), dentry, mode, 0);
if (err) {
done_path_create(&parent, dentry);
return err;
}
if (err)
goto out;
err = mutex_lock_interruptible(&u->bindlock);
if (err) {
done_path_create(&parent, dentry);
return err;
}
if (u->addr) {
mutex_unlock(&u->bindlock);
done_path_create(&parent, dentry);
return -EINVAL;
}
if (err)
goto out_unlink;
if (u->addr)
goto out_unlock;
addr->hash = UNIX_HASH_SIZE;
hash = d_backing_inode(dentry)->i_ino & (UNIX_HASH_SIZE - 1);
@ -1035,6 +1028,16 @@ static int unix_bind_bsd(struct sock *sk, struct unix_address *addr)
mutex_unlock(&u->bindlock);
done_path_create(&parent, dentry);
return 0;
out_unlock:
mutex_unlock(&u->bindlock);
err = -EINVAL;
out_unlink:
/* failed after successful mknod? unlink what we'd created... */
vfs_unlink(ns, d_inode(parent.dentry), dentry, NULL);
out:
done_path_create(&parent, dentry);
return err;
}
static int unix_bind_abstract(struct sock *sk, unsigned hash,