linux-kernel - [PATCH 06/12] Unionfs: don't dereference dentry without lower branches in d

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Date:	Fri, 25 Apr 2008 18:19:02 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	viro@....linux.org.uk, hch@...radead.org,
	Erez Zadok <ezk@...sunysb.edu>
Subject: [PATCH 06/12] Unionfs: don't dereference dentry without lower branches in d_release

Signed-off-by: Erez Zadok <ezk@...sunysb.edu>
---
 fs/unionfs/dentry.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index ee0da4f..e5f894c 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -482,12 +482,14 @@ static void unionfs_d_release(struct dentry *dentry)
 	int bindex, bstart, bend;
 
 	unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_CHILD);
+	if (unlikely(!UNIONFS_D(dentry)))
+		goto out;	/* skip if no lower branches */
 	/* must lock our branch configuration here */
 	unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
 
 	unionfs_check_dentry(dentry);
 	/* this could be a negative dentry, so check first */
-	if (unlikely(!UNIONFS_D(dentry) || dbstart(dentry) < 0)) {
+	if (dbstart(dentry) < 0) {
 		unionfs_unlock_dentry(dentry);
 		goto out;	/* due to a (normal) failed lookup */
 	}
-- 
1.5.2.2

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