eCryptfs: write lock requested keys

A requested key is write locked in order to prevent modifications on the
authentication token while it is being used.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index 520d05f5ad01..c27c0ecf90bc 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -254,8 +254,10 @@ static int ecryptfs_init_global_auth_toks(
                                "option: [%s]\n", global_auth_tok->sig);
                         global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
                         goto out;
-                } else
+                } else {
                         global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
+                        up_write(&(global_auth_tok->global_auth_tok_key)->sem);
+                }
         }
 out:
         return rc;