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oprofilefs: add missing ->i_mutex locking in object creation 

Right now it's safe only during initial mount *and* functions are asking
to be abused for dynamic adding of objects.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-01-28 14:42:42 -05:00
parent 2248b87ec1
commit 3f3834c354
1 changed files with 13 additions and 3 deletions
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16
drivers/oprofile/oprofilefs.c
View File

@ -139,17 +139,22 @@ static int __oprofilefs_create_file(struct super_block *sb,
struct dentry *dentry;
struct inode *inode;
mutex_lock(&root->d_inode->i_mutex);
dentry = d_alloc_name(root, name);
if (!dentry)
if (!dentry) {
mutex_unlock(&root->d_inode->i_mutex);
return -ENOMEM;
}
inode = oprofilefs_get_inode(sb, S_IFREG | perm);
if (!inode) {
dput(dentry);
mutex_unlock(&root->d_inode->i_mutex);
return -ENOMEM;
}
inode->i_fop = fops;
inode->i_private = priv;
d_add(dentry, inode);
dentry->d_inode->i_private = priv;
mutex_unlock(&root->d_inode->i_mutex);
return 0;
}
@ -212,17 +217,22 @@ struct dentry *oprofilefs_mkdir(struct super_block *sb,
struct dentry *dentry;
struct inode *inode;
mutex_lock(&root->d_inode->i_mutex);
dentry = d_alloc_name(root, name);
if (!dentry)
if (!dentry) {
mutex_unlock(&root->d_inode->i_mutex);
return NULL;
}
inode = oprofilefs_get_inode(sb, S_IFDIR | 0755);
if (!inode) {
dput(dentry);
mutex_unlock(&root->d_inode->i_mutex);
return NULL;
}
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
d_add(dentry, inode);
mutex_unlock(&root->d_inode->i_mutex);
return dentry;
}