debugfs: full_proxy_open(): free proxy on ->open() failure

Debugfs' full_proxy_open(), the ->open() installed at all inodes created
through debugfs_create_file(),
- grabs a reference to the original struct file_operations instance passed
  to debugfs_create_file(),
- dynamically allocates a proxy struct file_operations instance wrapping
  the original
- and installs this at the file's ->f_op.

Afterwards, it calls the original ->open() and passes its return value back
to the VFS layer.

Now, if that return value indicates failure, the VFS layer won't ever call
->release() and thus, neither the reference to the original file_operations
nor the memory for the proxy file_operations will get released, i.e. both
are leaked.

Upon failure of the original fops' ->open(), undo the proxy installation.
That is:
- Set the struct file ->f_op to what it had been when full_proxy_open()
  was entered.
- Drop the reference to the original file_operations.
- Free the memory holding the proxy file_operations.

Fixes: 49d200deaa ("debugfs: prevent access to removed files' private
                      data")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolai Stange 2016-05-24 13:08:53 +02:00 committed by Greg Kroah-Hartman
parent df4565f9eb
commit b10e3e9048
1 changed files with 4 additions and 2 deletions

View File

@ -262,8 +262,10 @@ static int full_proxy_open(struct inode *inode, struct file *filp)
if (real_fops->open) {
r = real_fops->open(inode, filp);
if (filp->f_op != proxy_fops) {
if (r) {
replace_fops(filp, d_inode(dentry)->i_fop);
goto free_proxy;
} else if (filp->f_op != proxy_fops) {
/* No protection against file removal anymore. */
WARN(1, "debugfs file owner replaced proxy fops: %pd",
dentry);