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-rw-r--r--src/or/connection_ap.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/or/connection_ap.c b/src/or/connection_ap.c
index 43bf960c6a..9d28d5a4a9 100644
--- a/src/or/connection_ap.c
+++ b/src/or/connection_ap.c
@@ -314,6 +314,8 @@ int ap_handshake_send_onion(connection_t *ap_conn, connection_t *n_conn, circuit
} else { /* last cell */
cell.length = dataleft;
memcpy(cell.payload, tmpbuf + tmpbuflen - dataleft, dataleft);
+ /* fill extra space with 0 bytes */
+ memset(cell.payload + dataleft, 0, CELL_PAYLOAD_SIZE - dataleft);
connection_write_cell_to_buf(&cell, n_conn);
dataleft = 0;
}