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VFS: Make clone_mnt()/copy_tree()/collect_mounts() return errors

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copy_tree() can theoretically fail in a case other than ENOMEM, but always
returns NULL which is interpreted by callers as -ENOMEM.  Change it to return
an explicit error.

Also change clone_mnt() for consistency and because union mounts will add new
error cases.

Thanks to Andreas Gruenbacher <agruen@suse.de> for a bug fix.
[AV: folded braino fix by Dan Carpenter]

Original-author: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Valerie Aurora <valerie.aurora@gmail.com>
Cc: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells
2012-06-25 12:55:18 +01:00
committed by Al Viro
parent 55e4def0a6
commit be34d1a3bc
3 changed files with 73 additions and 62 deletions
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10
kernel/audit_tree.c
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@@ -595,7 +595,7 @@ void audit_trim_trees(void)
root_mnt = collect_mounts(&path);
path_put(&path);
if (!root_mnt)
if (IS_ERR(root_mnt))
goto skip_it;
spin_lock(&hash_lock);
@@ -669,8 +669,8 @@ int audit_add_tree_rule(struct audit_krule *rule)
goto Err;
mnt = collect_mounts(&path);
path_put(&path);
if (!mnt) {
err = -ENOMEM;
if (IS_ERR(mnt)) {
err = PTR_ERR(mnt);
goto Err;
}
@@ -719,8 +719,8 @@ int audit_tag_tree(char *old, char *new)
return err;
tagged = collect_mounts(&path2);
path_put(&path2);
if (!tagged)
return -ENOMEM;
if (IS_ERR(tagged))
return PTR_ERR(tagged);
err = kern_path(old, 0, &path1);
if (err) {