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fsnotify: Remove fsnotify_duplicate_mark()

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There are only two calls sites of fsnotify_duplicate_mark(). Those are
in kernel/audit_tree.c and both are bogus. Vfsmount pointer is unused
for audit tree, inode pointer and group gets set in
fsnotify_add_mark_locked() later anyway, mask and free_mark are already
set in alloc_chunk(). In fact, calling fsnotify_duplicate_mark() is
actively harmful because following fsnotify_add_mark_locked() will leak
group reference by overwriting the group pointer. So just remove the two
calls to fsnotify_duplicate_mark() and the function.

Signed-off-by: Jan Kara <jack@suse.cz>
[PM: line wrapping to fit in 80 chars]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Jan Kara
2016-12-22 10:15:20 +01:00
committed by Paul Moore
parent 533c7b69c7
commit e3ba730702
3 changed files with 4 additions and 18 deletions
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8
kernel/audit_tree.c
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@@ -258,8 +258,8 @@ static void untag_chunk(struct node *p)
if (!new)
goto Fallback;
fsnotify_duplicate_mark(&new->mark, entry);
if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.inode, NULL, 1)) {
if (fsnotify_add_mark(&new->mark,
entry->group, entry->inode, NULL, 1)) {
fsnotify_put_mark(&new->mark);
goto Fallback;
}
@@ -395,8 +395,8 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree)
return -ENOENT;
}
fsnotify_duplicate_mark(chunk_entry, old_entry);
if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->inode, NULL, 1)) {
if (fsnotify_add_mark(chunk_entry,
old_entry->group, old_entry->inode, NULL, 1)) {
spin_unlock(&old_entry->lock);
fsnotify_put_mark(chunk_entry);
fsnotify_put_mark(old_entry);