From 65c333367b1aea57d58168ad3dc1df27b0227401 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 24 Nov 2006 13:50:09 -0500 Subject: [PATCH] DebugFS : more file/directory creation error handling Correct dentry count to handle creation errors. This patch puts a dput at the file creation instead of the file removal : lookup_one_len already returns a dentry with reference count of 1. Then, the dget() in simple_mknod increments it when the dentry is associated with a file. In a scenario where simple_create or simple_mkdir returns an error, this would lead to an unwanted increment of the reference counter, therefore making file removal impossible. Signed-off-by: Mathieu Desnoyers Signed-off-by: Greg Kroah-Hartman --- fs/debugfs/inode.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index d6c5fb53c746..554f4a9dfaf8 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -162,6 +162,7 @@ static int debugfs_create_by_name(const char *name, mode_t mode, error = debugfs_mkdir(parent->d_inode, *dentry, mode); else error = debugfs_create(parent->d_inode, *dentry, mode); + dput(*dentry); } else error = PTR_ERR(*dentry); mutex_unlock(&parent->d_inode->i_mutex); @@ -273,6 +274,7 @@ EXPORT_SYMBOL_GPL(debugfs_create_dir); void debugfs_remove(struct dentry *dentry) { struct dentry *parent; + int ret = 0; if (!dentry) return; @@ -284,11 +286,15 @@ void debugfs_remove(struct dentry *dentry) mutex_lock(&parent->d_inode->i_mutex); if (debugfs_positive(dentry)) { if (dentry->d_inode) { - if (S_ISDIR(dentry->d_inode->i_mode)) - simple_rmdir(parent->d_inode, dentry); - else + if (S_ISDIR(dentry->d_inode->i_mode)) { + ret = simple_rmdir(parent->d_inode, dentry); + if (ret) + printk(KERN_ERR + "DebugFS rmdir on %s failed : " + "directory not empty.\n", + dentry->d_name.name); + } else simple_unlink(parent->d_inode, dentry); - dput(dentry); } } mutex_unlock(&parent->d_inode->i_mutex); -- 2.20.1