3 files changed, 9 insertions, 10 deletions

diff --git a/src/or/shared_random.h b/src/or/shared_random.h
index d1ba99d1fe..9885934cc7 100644
--- a/src/or/shared_random.h
+++ b/src/or/shared_random.h
@@ -34,11 +34,11 @@
 #define SR_SRV_MSG_LEN \
   (SR_SRV_TOKEN_LEN + sizeof(uint64_t) + sizeof(uint32_t) + DIGEST256_LEN)
 
-/* Length of base64 encoded commit NOT including the NULL terminated byte.
- * Formula is taken from base64_encode_size. */
+/* Length of base64 encoded commit NOT including the NUL terminated byte.
+ * Formula is taken from base64_encode_size. This adds up to 56 bytes. */
 #define SR_COMMIT_BASE64_LEN \
   (((SR_COMMIT_LEN - 1) / 3) * 4 + 4)
-/* Length of base64 encoded reveal NOT including the NULL terminated byte.
+/* Length of base64 encoded reveal NOT including the NUL terminated byte.
  * Formula is taken from base64_encode_size. This adds up to 56 bytes. */
 #define SR_REVEAL_BASE64_LEN \
   (((SR_REVEAL_LEN - 1) / 3) * 4 + 4)
diff --git a/src/or/shared_random_state.c b/src/or/shared_random_state.c
index 73df9c43fb..870b992837 100644
--- a/src/or/shared_random_state.c
+++ b/src/or/shared_random_state.c
@@ -617,26 +617,24 @@ disk_state_update(void)
   /* Reset current disk state. */
   disk_state_reset();
 
-  /* First, update elements that we don't need to iterate over a list to
-   * construct something. */
+  /* First, update elements that we don't need to do a construction. */
   sr_disk_state->Version = sr_state->version;
   sr_disk_state->ValidUntil = sr_state->valid_until;
   sr_disk_state->ValidAfter = sr_state->valid_after;
 
   /* Shared random values. */
   next = &sr_disk_state->SharedRandValues;
-  *next = NULL;
   if (sr_state->previous_srv != NULL) {
     *next = line = tor_malloc_zero(sizeof(config_line_t));
     line->key = tor_strdup(dstate_prev_srv_key);
     disk_state_put_srv_line(sr_state->previous_srv, line);
+    /* Go to the next shared random value. */
     next = &(line->next);
   }
   if (sr_state->current_srv != NULL) {
     *next = line = tor_malloc_zero(sizeof(*line));
     line->key = tor_strdup(dstate_cur_srv_key);
     disk_state_put_srv_line(sr_state->current_srv, line);
-    next = &(line->next);
   }
 
   /* Parse the commits and construct config line(s). */
diff --git a/src/test/test_shared_random.c b/src/test/test_shared_random.c
index 48aa404e85..886cee3a33 100644
--- a/src/test/test_shared_random.c
+++ b/src/test/test_shared_random.c
@@ -944,13 +944,14 @@ test_utils(void *arg)
   /* Testing commitments_are_the_same(). Currently, the check is to test the
    * value of the encoded commit so let's make sure that actually works. */
   {
-    /* Payload of 55 bytes that is the length of
-     * sr_commit_t->encoded_commit. */
+    /* Payload of 57 bytes that is the length of sr_commit_t->encoded_commit.
+     * 56 bytes of payload and a NUL terminated byte at the end ('\x00')
+     * which comes down to SR_COMMIT_BASE64_LEN + 1. */
     const char *payload =
       "\x5d\xb9\x60\xb6\xcc\x51\x68\x52\x31\xd9\x88\x88\x71\x71\xe0\x30"
       "\x59\x55\x7f\xcd\x61\xc0\x4b\x05\xb8\xcd\xc1\x48\xe9\xcd\x16\x1f"
       "\x70\x15\x0c\xfc\xd3\x1a\x75\xd0\x93\x6c\xc4\xe0\x5c\xbe\xe2\x18"
-      "\xc7\xaf\x72\xb6\x7c\x9b\x52";
+      "\xc7\xaf\x72\xb6\x7c\x9b\x52\x00";
     sr_commit_t commit1, commit2;
     memcpy(commit1.encoded_commit, payload, sizeof(commit1.encoded_commit));
     memcpy(commit2.encoded_commit, payload, sizeof(commit2.encoded_commit));