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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-18 13:08:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-04 12:26:10 +0300 |
| commit | 6f15d498bfe835b9e2fc2c6f72dde056022a4158 (patch) | |
| tree | 4c4423ecc0afae76c5894539df906bb24fdb0140 /fs/debugfs | |
| parent | de5ae40870350dc8f4d9dd70cd73410f167a23eb (diff) | |
| download | linux-6f15d498bfe835b9e2fc2c6f72dde056022a4158.tar.xz | |
debugfs: do not attempt to create a new file before the filesystem is initalized
commit 56348560d495d2501e87db559a61de717cd3ab02 upstream.
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 42b0295465b4..1c74a7cbf5b1 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -315,6 +315,9 @@ static struct dentry *start_creating(const char *name, struct dentry *parent) struct dentry *dentry; int error; + if (!debugfs_initialized()) + return ERR_PTR(-ENOENT); + pr_debug("creating file '%s'\n", name); if (IS_ERR(parent)) |