ecryptfs: redo dget,mntget on dentry_open failure

Thanks to Jeff Moyer for pointing this out.

If the RDWR dentry_open() in ecryptfs_init_persistent_file fails,
it will do a dput/mntput.  Need to re-take references if we
retry as RDONLY.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Acked-by: Mike Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index a277754da171..e5580bcb923a 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -138,11 +138,14 @@ int ecryptfs_init_persistent_file(struct dentry *ecryptfs_dentry)
                 inode_info->lower_file = dentry_open(lower_dentry,
                                                      lower_mnt,
                                                      (O_RDWR | O_LARGEFILE));
-                if (IS_ERR(inode_info->lower_file))
+                if (IS_ERR(inode_info->lower_file)) {
+                        dget(lower_dentry);
+                        mntget(lower_mnt);
                         inode_info->lower_file = dentry_open(lower_dentry,
                                                              lower_mnt,
                                                              (O_RDONLY
                                                               | O_LARGEFILE));
+                }
                 if (IS_ERR(inode_info->lower_file)) {
                         printk(KERN_ERR "Error opening lower persistent file "
                                "for lower_dentry [0x%p] and lower_mnt [0x%p]\n",