]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
debugfs: open_proxy_open(): avoid double fops release
authorNicolai Stange <nicstange@gmail.com>
Tue, 24 May 2016 11:08:54 +0000 (13:08 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 15 Jun 2016 11:56:35 +0000 (04:56 -0700)
Debugfs' open_proxy_open(), the ->open() installed at all inodes created
through debugfs_create_file_unsafe(),
- grabs a reference to the original file_operations instance passed to
  debugfs_create_file_unsafe() via fops_get(),
- installs it at the file's ->f_op by means of replace_fops()
- and calls fops_put() on it.

Since the semantics of replace_fops() are such that the reference's
ownership is transferred, the subsequent fops_put() will result in a double
release when the file is eventually closed.

Currently, this is not an issue since fops_put() basically does a
module_put() on the file_operations' ->owner only and there don't exist any
modules calling debugfs_create_file_unsafe() yet. This is expected to
change in the future though, c.f. commit c64688081490 ("debugfs: add
support for self-protecting attribute file fops").

Remove the call to fops_put() from open_proxy_open().

Fixes: 9fd4dcece43a ("debugfs: prevent access to possibly dead
                      file_operations at file open")
Signed-off-by: Nicolai Stange <nicstange@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/debugfs/file.c

index d1ec80331414840e9141ee13174599918a8f2766..592059f88e04f7757c9e3bc413ab78bec58dee09 100644 (file)
@@ -127,7 +127,6 @@ static int open_proxy_open(struct inode *inode, struct file *filp)
                r = real_fops->open(inode, filp);
 
 out:
-       fops_put(real_fops);
        debugfs_use_file_finish(srcu_idx);
        return r;
 }