[PATCH 3/4] smb: server: Free session data with kfree_sensitive() to avoid leaking of data

[Thomas Huth <thuth@redhat.com>]

From: Thomas Huth <thuth@redhat.com>

struct ksmbd_session contains some arrays with sensitive information, like
sess_key, smb3encryptionkey, smb3decryptionkey and smb3signingkey. Thus
let's make sure that this information cannot leak via the heap and use
kfree_sensitive() to free it.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 fs/smb/server/mgmt/user_session.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/smb/server/mgmt/user_session.c b/fs/smb/server/mgmt/user_session.c
index f99c86284ba3d..9cb990a22fd56 100644
--- a/fs/smb/server/mgmt/user_session.c
+++ b/fs/smb/server/mgmt/user_session.c
@@ -389,10 +389,10 @@ void ksmbd_session_destroy(struct ksmbd_session *sess)
 	ksmbd_launch_ksmbd_durable_scavenger();
 	ksmbd_session_rpc_clear_list(sess);
 	free_channel_list(sess);
-	kfree(sess->Preauth_HashValue);
+	kfree_sensitive(sess->Preauth_HashValue);
 	ksmbd_release_id(&session_ida, sess->id);
 	ida_destroy(&sess->tree_conn_ida);
-	kfree(sess);
+	kfree_sensitive(sess);
 }
 
 struct ksmbd_session *__session_lookup(unsigned long long id)
-- 
2.55.0