[PATCH] eCryptfs: Fix possible NULL ptr deref in ecryptfs_d_release()

[Michael Halcrow <mhalcrow@us.ibm.com>]

ecryptfs_d_release() first dereferences a pointer (via
ecryptfs_dentry_to_lower()) and then afterwards checks to see if the
pointer it just dereferenced is NULL (via
ecryptfs_dentry_to_private()). This patch moves all of the work done
on the dereferenced pointer inside a block governed by the condition
that the pointer is non-NULL.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
---
 fs/ecryptfs/dentry.c |   15 +++++----------
 1 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/fs/ecryptfs/dentry.c b/fs/ecryptfs/dentry.c
index 329efcd..cb20b96 100644
--- a/fs/ecryptfs/dentry.c
+++ b/fs/ecryptfs/dentry.c
@@ -78,18 +78,13 @@ struct kmem_cache *ecryptfs_dentry_info_cache;
  */
 static void ecryptfs_d_release(struct dentry *dentry)
 {
-	struct dentry *lower_dentry;
-
-	lower_dentry = ecryptfs_dentry_to_lower(dentry);
-	if (ecryptfs_dentry_to_private(dentry))
+	if (ecryptfs_dentry_to_private(dentry)) {
+		if (ecryptfs_dentry_to_lower(dentry)) {
+			mntput(ecryptfs_dentry_to_lower_mnt(dentry));
+			dput(ecryptfs_dentry_to_lower(dentry));
+		}
 		kmem_cache_free(ecryptfs_dentry_info_cache,
 				ecryptfs_dentry_to_private(dentry));
-	if (lower_dentry) {
-		struct vfsmount *lower_mnt =
-			ecryptfs_dentry_to_lower_mnt(dentry);
-
-		mntput(lower_mnt);
-		dput(lower_dentry);
 	}
 	return;
 }
-- 
1.4.4.4