commit 8ef41d98a74b4d0996e0bca76e49b85f82ea9390
Author: Erez Zadok <[EMAIL PROTECTED]>
Date:   Thu Jan 10 07:02:38 2008 -0500

    Unionfs: handle on lower inodes in lookup
    
    Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>

diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index 4f67419..c3e7472 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -169,8 +169,12 @@ static bool __unionfs_d_revalidate_one(struct dentry 
*dentry,
                        valid = false;
        }
 
-       if (!dentry->d_inode)
+       if (!dentry->d_inode ||
+           ibstart(dentry->d_inode) < 0 ||
+           ibend(dentry->d_inode) < 0) {
                valid = false;
+               goto out;
+       }
 
        if (valid) {
                /*
diff --git a/fs/unionfs/lookup.c b/fs/unionfs/lookup.c
index d939b5d..117adc7 100644
--- a/fs/unionfs/lookup.c
+++ b/fs/unionfs/lookup.c
@@ -160,6 +160,7 @@ struct dentry *unionfs_lookup_backend(struct dentry *dentry,
                        continue;
 
                /* Now do regular lookup; lookup foo */
+               BUG_ON(!lower_dir_dentry);
                lower_dentry = lookup_one_len(name, lower_dir_dentry, namelen);
                if (IS_ERR(lower_dentry)) {
                        dput(first_lower_dentry);
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