From eb3b176796b0e53fd26fce86847231542eb0d198 Mon Sep 17 00:00:00 2001 From: Ian Kent Date: Wed, 23 Jul 2008 21:30:22 -0700 Subject: [PATCH] autofs4: detect invalid direct mount requests autofs v5 direct and offset mounts within an autofs filesystem are triggered by existing autofs triger mounts so the mount point dentry must be positive. If the mount point dentry is negative then the trigger doesn't exist so we can return fail immediately. Signed-off-by: Ian Kent Cc: Jeff Moyer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/autofs4/waitq.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c index 3458dbc..bcb6c52 100644 --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -328,6 +328,10 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry, if (sbi->catatonic) return -ENOENT; + if (!dentry->d_inode && + (sbi->type & (AUTOFS_TYPE_DIRECT | AUTOFS_TYPE_OFFSET))) + return -ENOENT; + name = kmalloc(NAME_MAX + 1, GFP_KERNEL); if (!name) return -ENOMEM; -- 2.7.4