autofs4: check for invalid dentry in getpath
authorIan Kent <raven@themaw.net>
Thu, 1 May 2008 11:35:07 +0000 (04:35 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 1 May 2008 15:04:01 +0000 (08:04 -0700)
Catch invalid dentry when calculating its path.

Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/autofs4/waitq.c

index 1fe28e4..75e5955 100644 (file)
@@ -171,7 +171,7 @@ static int autofs4_getpath(struct autofs_sb_info *sbi,
        for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent)
                len += tmp->d_name.len + 1;
 
-       if (--len > NAME_MAX) {
+       if (!len || --len > NAME_MAX) {
                spin_unlock(&dcache_lock);
                return 0;
        }