eCryptfs: ecryptfs_keyring_auth_tok_for_sig() bug fix

The pointer '(*auth_tok_key)' is set to NULL in case request_key()
fails, in order to prevent its use by functions calling
ecryptfs_keyring_auth_tok_for_sig().

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

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index c1436cff6f2d..4feb78c23651 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -1563,6 +1563,7 @@ int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
                 printk(KERN_ERR "Could not find key with description: [%s]\n",
                        sig);
                 rc = process_request_key_err(PTR_ERR(*auth_tok_key));
+                (*auth_tok_key) = NULL;
                 goto out;
         }
         (*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key);