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drm_mode_create_lease_ioctl(): fix open-coded filp_clone_open()

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Failure of ->open() should *not* be followed by fput().  Fixed by
using filp_clone_open(), which gets the cleanups right.

Cc: stable@vger.kernel.org
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-06-08 11:17:54 -04:00
parent 877f919e19
commit b4e7a7a88b
3 changed files with 2 additions and 16 deletions
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16
drivers/gpu/drm/drm_lease.c
View File

@ -553,24 +553,13 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
/* Clone the lessor file to create a new file for us */
DRM_DEBUG_LEASE("Allocating lease file\n");
path_get(&lessor_file->f_path);
lessee_file = alloc_file(&lessor_file->f_path,
lessor_file->f_mode,
fops_get(lessor_file->f_inode->i_fop));
lessee_file = filp_clone_open(lessor_file);
if (IS_ERR(lessee_file)) {
ret = PTR_ERR(lessee_file);
goto out_lessee;
}
/* Initialize the new file for DRM */
DRM_DEBUG_LEASE("Initializing the file with %p\n", lessee_file->f_op->open);
ret = lessee_file->f_op->open(lessee_file->f_inode, lessee_file);
if (ret)
goto out_lessee_file;
lessee_priv = lessee_file->private_data;
/* Change the file to a master one */
drm_master_put(&lessee_priv->master);
lessee_priv->master = lessee;
@ -588,9 +577,6 @@ int drm_mode_create_lease_ioctl(struct drm_device *dev,
DRM_DEBUG_LEASE("drm_mode_create_lease_ioctl succeeded\n");
return 0;
out_lessee_file:
fput(lessee_file);
out_lessee:
drm_master_put(&lessee);

1
fs/internal.h
View File

@ -127,7 +127,6 @@ int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
extern int open_check_o_direct(struct file *f);
extern int vfs_open(const struct path *, struct file *, const struct cred *);
extern struct file *filp_clone_open(struct file *);
/*
* inode.c

1
include/linux/fs.h
View File

@ -2422,6 +2422,7 @@ extern struct file *filp_open(const char *, int, umode_t);
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
const char *, int, umode_t);
extern struct file * dentry_open(const struct path *, int, const struct cred *);
extern struct file *filp_clone_open(struct file *);
extern int filp_close(struct file *, fl_owner_t id);
extern struct filename *getname_flags(const char __user *, int, int *);