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sysfs: make __sysfs_add_one() fail if the parent isn't a directory

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Currently the kobject based interface guarantees that a parent
sysfs_dirent is always a directory; however, the planned kernfs
interface will be directly based on sysfs_dirents and the caller may
specify non-directory node as the parent.  Add an explicit check in
__sysfs_add_one() so that such attempts fail with -EINVAL.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tejun Heo 2013-11-23 17:21:47 -05:00 committed by Greg Kroah-Hartman
parent c84a3b2779
commit ae2108ad32
1 changed files with 3 additions and 0 deletions
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3
fs/sysfs/dir.c
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@ -429,6 +429,9 @@ int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
return -EINVAL;
}
if (sysfs_type(parent_sd) != SYSFS_DIR)
return -EINVAL;
sd->s_hash = sysfs_name_hash(sd->s_name, sd->s_ns);
sd->s_parent = sysfs_get(parent_sd);