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-rw-r--r--javascript/olm_outbound_group_session.js6
1 files changed, 4 insertions, 2 deletions
diff --git a/javascript/olm_outbound_group_session.js b/javascript/olm_outbound_group_session.js
index 01fee0b..0402c3c 100644
--- a/javascript/olm_outbound_group_session.js
+++ b/javascript/olm_outbound_group_session.js
@@ -64,9 +64,9 @@ OutboundGroupSession.prototype['create'] = restore_stack(function() {
});
OutboundGroupSession.prototype['encrypt'] = function(plaintext) {
- var plaintext_buffer, message_buffer;
+ var plaintext_buffer, message_buffer, plaintext_length;
try {
- var plaintext_length = Module['lengthBytesUTF8'](plaintext);
+ plaintext_length = Module['lengthBytesUTF8'](plaintext);
var message_length = outbound_group_session_method(
Module['_olm_group_encrypt_message_length']
@@ -86,6 +86,8 @@ OutboundGroupSession.prototype['encrypt'] = function(plaintext) {
return Module['UTF8ToString'](message_buffer);
} finally {
if (plaintext_buffer !== undefined) {
+ // don't leave a copy of the plaintext in the heap.
+ bzero(plaintext_buffer, plaintext_length + 1);
free(plaintext_buffer);
}
if (message_buffer !== undefined) {