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authorIan Kent <raven@themaw.net>2008-07-23 21:30:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:32 -0700
commiteb3b176796b0e53fd26fce86847231542eb0d198 (patch)
tree85bd1a2e79e92d1ff52714aa19888ef7e4f80638 /fs/autofs4
parent296f7bf78bc5c7a4d772aea580ce800d14040d1a (diff)
downloadop-kernel-dev-eb3b176796b0e53fd26fce86847231542eb0d198.zip
op-kernel-dev-eb3b176796b0e53fd26fce86847231542eb0d198.tar.gz
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>
Diffstat (limited to 'fs/autofs4')
-rw-r--r--fs/autofs4/waitq.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index 3458dbc8..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;
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