commit 87b2e713b8779fe141cdc4491a6489d311a6aee9
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Sun Mar 4 15:21:14 2007 -0500
fs/unionfs/: Fix dentry leak in copyup_named_dentry
When we chmod a directory on a readonly branch, and have to copy it up, we
forget to dput(). If this was a file, it gets dput indirectly through other
functions we call, but not if it was a directory.
Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>
Signed-off-by: Josef 'Jeff' Sipek <[EMAIL PROTECTED]>
diff --git a/fs/unionfs/copyup.c b/fs/unionfs/copyup.c
index e0075ca..e24d940 100644
--- a/fs/unionfs/copyup.c
+++ b/fs/unionfs/copyup.c
@@ -352,20 +352,18 @@ static int copyup_named_dentry(struct inode *dir, struct
dentry *dentry,
unionfs_read_lock(sb);
- if ((err = is_robranch_super(sb, new_bindex))) {
- dput(old_hidden_dentry);
+ if ((err = is_robranch_super(sb, new_bindex)))
goto out;
- }
/* Create the directory structure above this dentry. */
new_hidden_dentry = create_parents_named(dir, dentry, name, new_bindex);
if (IS_ERR(new_hidden_dentry)) {
- dput(old_hidden_dentry);
err = PTR_ERR(new_hidden_dentry);
goto out;
}
old_hidden_dentry = unionfs_lower_dentry_idx(dentry, old_bindex);
+ /* we conditionally dput this old_hidden_dentry at end of function */
dget(old_hidden_dentry);
/* For symlinks, we must read the link before we lock the directory. */
@@ -460,6 +458,14 @@ out_unlock:
unlock_dir(new_hidden_parent_dentry);
out_free:
+ /*
+ * If old_hidden_dentry was a directory, we need to dput it. If it
+ * was a file, then it was already dput indirectly by other
+ * functions we call ablve which operate on regular files.
+ */
+ if (old_hidden_dentry && old_hidden_dentry->d_inode &&
+ S_ISDIR(old_hidden_dentry->d_inode->i_mode))
+ dput(old_hidden_dentry);
kfree(symbuf);
out:
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