diff options
| author |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-18 11:08:18 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-18 16:23:49 +0100 |
| commit | 56348560d495d2501e87db559a61de717cd3ab02 (patch) | |
| tree | 603c1a3eebb8164517317fa647f180d8b83f5695 /fs/debugfs | |
| parent | debugfs: be more robust at handling improper input in debugfs_lookup() (diff) | |
| download | wireguard-linux-56348560d495d2501e87db559a61de717cd3ab02.tar.xz wireguard-linux-56348560d495d2501e87db559a61de717cd3ab02.zip | |
debugfs: do not attempt to create a new file before the filesystem is initalized
Some subsystems want to add debugfs files at early boot, way before
debugfs is initialized. This seems to work somehow as the vfs layer
will not allow it to happen, but let's be explicit and test to ensure we
are properly up and running before allowing files to be created.
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: stable <stable@vger.kernel.org>
Reported-by: Michael Walle <michael@walle.cc>
Reported-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210218100818.3622317-2-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/debugfs')
| -rw-r--r-- | fs/debugfs/inode.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index bbeb563cbe78..86c7f0489620 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -318,6 +318,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) if (!(debugfs_allow & DEBUGFS_ALLOW_API)) return ERR_PTR(-EPERM); + if (!debugfs_initialized()) + return ERR_PTR(-ENOENT); + pr_debug("creating file '%s'\n", name); if (IS_ERR(parent)) |