Commit eb3b1767 authored Jul 23, 2008 by Ian Kent Committed by Linus Torvalds Jul 24, 2008

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 <raven@themaw.net>
Cc: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 296f7bf7

fs/autofs4/waitq.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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;

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