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Commit 8d8ffefa authored by André Goddard Rosa's avatar André Goddard Rosa Committed by Al Viro
Browse files

mqueue: only set error codes if they are really necessary 



... postponing assignments until they're needed. Doesn't change code size.

Signed-off-by: default avatarAndré Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 04db0dde

ipc/mqueue.c

+50 −27
Original line number Diff line number Diff line
@@ -184,7 +184,7 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent) 
{

	struct inode *inode;

	struct ipc_namespace *ns = data;

	int error = 0;

	int error;



	sb->s_blocksize = PAGE_CACHE_SIZE;

	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
@@ -202,7 +202,9 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent) 
	if (!sb->s_root) {

		iput(inode);

		error = -ENOMEM;

		goto out;

	}

	error = 0;



out:

	return error;
@@ -621,9 +623,10 @@ static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir, 
	int ret;



	if (attr) {

		if (!mq_attr_ok(ipc_ns, attr)) {

			ret = -EINVAL;

		if (!mq_attr_ok(ipc_ns, attr))

			goto out;

		}

		/* store for use during create */

		dentry->d_fsdata = attr;

	}
@@ -714,9 +717,10 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode, 
	if (oflag & O_CREAT) {

		if (dentry->d_inode) {	/* entry already exists */

			audit_inode(name, dentry);

			if (oflag & O_EXCL) {

				error = -EEXIST;

			if (oflag & O_EXCL)

				goto out;

			}

			filp = do_open(ipc_ns, dentry, oflag);

		} else {

			filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root,
@@ -724,9 +728,10 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode, 
						u_attr ? &attr : NULL);

		}

	} else {

		if (!dentry->d_inode) {

			error = -ENOENT;

		if (!dentry->d_inode)

			goto out;

		}

		audit_inode(name, dentry);

		filp = do_open(ipc_ns, dentry, oflag);

	}
@@ -873,19 +878,24 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr, 
	audit_mq_sendrecv(mqdes, msg_len, msg_prio, p);

	timeout = prepare_timeout(p);



	ret = -EBADF;

	filp = fget(mqdes);

	if (unlikely(!filp))

	if (unlikely(!filp)) {

		ret = -EBADF;

		goto out;

	}



	inode = filp->f_path.dentry->d_inode;

	if (unlikely(filp->f_op != &mqueue_file_operations))

	if (unlikely(filp->f_op != &mqueue_file_operations)) {

		ret = -EBADF;

		goto out_fput;

	}

	info = MQUEUE_I(inode);

	audit_inode(NULL, filp->f_path.dentry);



	if (unlikely(!(filp->f_mode & FMODE_WRITE)))

	if (unlikely(!(filp->f_mode & FMODE_WRITE))) {

		ret = -EBADF;

		goto out_fput;

	}



	if (unlikely(msg_len > info->attr.mq_msgsize)) {

		ret = -EMSGSIZE;
@@ -962,19 +972,24 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr, 
	audit_mq_sendrecv(mqdes, msg_len, 0, p);

	timeout = prepare_timeout(p);



	ret = -EBADF;

	filp = fget(mqdes);

	if (unlikely(!filp))

	if (unlikely(!filp)) {

		ret = -EBADF;

		goto out;

	}



	inode = filp->f_path.dentry->d_inode;

	if (unlikely(filp->f_op != &mqueue_file_operations))

	if (unlikely(filp->f_op != &mqueue_file_operations)) {

		ret = -EBADF;

		goto out_fput;

	}

	info = MQUEUE_I(inode);

	audit_inode(NULL, filp->f_path.dentry);



	if (unlikely(!(filp->f_mode & FMODE_READ)))

	if (unlikely(!(filp->f_mode & FMODE_READ))) {

		ret = -EBADF;

		goto out_fput;

	}



	/* checks if buffer is big enough */

	if (unlikely(msg_len < info->attr.mq_msgsize)) {
@@ -1064,13 +1079,14 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, 


			/* create the notify skb */

			nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL);

			if (!nc) {

				ret = -ENOMEM;

			if (!nc)

				goto out;

			ret = -EFAULT;

			}

			if (copy_from_user(nc->data,

					notification.sigev_value.sival_ptr,

					NOTIFY_COOKIE_LEN)) {

				ret = -EFAULT;

				goto out;

			}
@@ -1079,9 +1095,10 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, 
			/* and attach it to the socket */

retry:

			filp = fget(notification.sigev_signo);

			if (!filp) {

				ret = -EBADF;

			if (!filp)

				goto out;

			}

			sock = netlink_getsockbyfilp(filp);

			fput(filp);

			if (IS_ERR(sock)) {
@@ -1102,14 +1119,17 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes, 
		}

	}



	ret = -EBADF;

	filp = fget(mqdes);

	if (!filp)

	if (!filp) {

		ret = -EBADF;

		goto out;

	}



	inode = filp->f_path.dentry->d_inode;

	if (unlikely(filp->f_op != &mqueue_file_operations))

	if (unlikely(filp->f_op != &mqueue_file_operations)) {

		ret = -EBADF;

		goto out_fput;

	}

	info = MQUEUE_I(inode);



	ret = 0;
@@ -1172,14 +1192,17 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes, 
			return -EINVAL;

	}



	ret = -EBADF;

	filp = fget(mqdes);

	if (!filp)

	if (!filp) {

		ret = -EBADF;

		goto out;

	}



	inode = filp->f_path.dentry->d_inode;

	if (unlikely(filp->f_op != &mqueue_file_operations))

	if (unlikely(filp->f_op != &mqueue_file_operations)) {

		ret = -EBADF;

		goto out_fput;

	}

	info = MQUEUE_I(inode);



	spin_lock(&info->lock);