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Commit bf07803a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Artem Bityutskiy
Browse files

UBI: cleanup ioctl handling 



- don't do access_ok + get/put user but use the proper macro
- remove useless checks

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent 16d8cd7c

drivers/mtd/ubi/cdev.c

+5 −28
Original line number Diff line number Diff line
@@ -414,19 +414,7 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file, 
	struct ubi_device *ubi = vol->ubi;

	void __user *argp = (void __user *)arg;



	if (_IOC_NR(cmd) > VOL_CDEV_IOC_MAX_SEQ ||

	    _IOC_TYPE(cmd) != UBI_VOL_IOC_MAGIC)

		return -ENOTTY;



	if (_IOC_DIR(cmd) && _IOC_READ)

		err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd));

	else if (_IOC_DIR(cmd) && _IOC_WRITE)

		err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd));

	if (err)

		return -EFAULT;



	switch (cmd) {



	/* Volume update command */

	case UBI_IOCVOLUP:

	{
@@ -472,7 +460,7 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file, 
	{

		int32_t lnum;



		err = __get_user(lnum, (__user int32_t *)argp);

		err = get_user(lnum, (__user int32_t *)argp);

		if (err) {

			err = -EFAULT;

			break;
@@ -588,17 +576,6 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
	struct ubi_volume_desc *desc;

	void __user *argp = (void __user *)arg;



	if (_IOC_NR(cmd) > UBI_CDEV_IOC_MAX_SEQ ||

	    _IOC_TYPE(cmd) != UBI_IOC_MAGIC)

		return -ENOTTY;



	if (_IOC_DIR(cmd) && _IOC_READ)

		err = !access_ok(VERIFY_WRITE, argp, _IOC_SIZE(cmd));

	else if (_IOC_DIR(cmd) && _IOC_WRITE)

		err = !access_ok(VERIFY_READ, argp, _IOC_SIZE(cmd));

	if (err)

		return -EFAULT;



	if (!capable(CAP_SYS_RESOURCE))

		return -EPERM;
@@ -613,7 +590,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
		struct ubi_mkvol_req req;



		dbg_msg("create volume");

		err = __copy_from_user(&req, argp,

		err = copy_from_user(&req, argp,

				       sizeof(struct ubi_mkvol_req));

		if (err) {

			err = -EFAULT;
@@ -630,7 +607,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
		if (err)

			break;



		err = __put_user(req.vol_id, (__user int32_t *)argp);

		err = put_user(req.vol_id, (__user int32_t *)argp);

		if (err)

			err = -EFAULT;
@@ -643,7 +620,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
		int vol_id;



		dbg_msg("remove volume");

		err = __get_user(vol_id, (__user int32_t *)argp);

		err = get_user(vol_id, (__user int32_t *)argp);

		if (err) {

			err = -EFAULT;

			break;
@@ -670,7 +647,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file, 
		struct ubi_rsvol_req req;



		dbg_msg("re-size volume");

		err = __copy_from_user(&req, argp,

		err = copy_from_user(&req, argp,

				       sizeof(struct ubi_rsvol_req));

		if (err) {

			err = -EFAULT;