sysfs: fix i_mutex locking in sysfs_get_dentry()
lookup_one_len_kern() should be called with the parent's i_mutex locked. Fix it. Spotted by Eric W. Biederman. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -130,8 +130,10 @@ struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd)
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/* look it up */
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parent_dentry = dentry;
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mutex_lock(&parent_dentry->d_inode->i_mutex);
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dentry = lookup_one_len_kern(cur->s_name, parent_dentry,
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strlen(cur->s_name));
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mutex_unlock(&parent_dentry->d_inode->i_mutex);
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dput(parent_dentry);
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if (IS_ERR(dentry)) {
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