eCryptFS: fix imbalanced mutex locking

Fix imbalanced calls for mutex lock/unlock on ecryptfs_daemon_hash_mux
Revealed by Ingo Molnar: http://lkml.org/lkml/2008/5/7/260

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/ecryptfs/miscdev.c b/fs/ecryptfs/miscdev.c
index 788995efd1d3..6560da1a58ce 100644
--- a/fs/ecryptfs/miscdev.c
+++ b/fs/ecryptfs/miscdev.c
@@ -257,12 +257,14 @@ ecryptfs_miscdev_read(struct file *file, char __user *buf, size_t count,
         mutex_lock(&daemon->mux);
         if (daemon->flags & ECRYPTFS_DAEMON_ZOMBIE) {
                 rc = 0;
+                mutex_unlock(&ecryptfs_daemon_hash_mux);
                 printk(KERN_WARNING "%s: Attempt to read from zombified "
                        "daemon\n", __func__);
                 goto out_unlock_daemon;
         }
         if (daemon->flags & ECRYPTFS_DAEMON_IN_READ) {
                 rc = 0;
+                mutex_unlock(&ecryptfs_daemon_hash_mux);
                 goto out_unlock_daemon;
         }
         /* This daemon will not go away so long as this flag is set */