diff --git a/changes/ticket13036 b/changes/ticket13036
new file mode 100644
index 0000000000..1b4784358a
--- /dev/null
+++ b/changes/ticket13036
@@ -0,0 +1,5 @@
+  o Minor bugfixes:
+    - Fix a large number of false positive warnings from the clang
+      analyzer static analysis tool. This should make real warnings
+      easier for clang analyzer to find. Patch from "teor". Closes
+      ticket 13036.
diff --git a/src/common/address.c b/src/common/address.c
index 29d4c0447e..8591f387e6 100644
--- a/src/common/address.c
+++ b/src/common/address.c
@@ -324,6 +324,8 @@ tor_addr_is_internal_(const tor_addr_t *addr, int for_listening,
   uint32_t iph4 = 0;
   uint32_t iph6[4];
   sa_family_t v_family;
+
+  tor_assert(addr);
   v_family = tor_addr_family(addr);
 
   if (v_family == AF_INET) {
diff --git a/src/or/circuitmux.c b/src/or/circuitmux.c
index 55580d5c29..e4571ff944 100644
--- a/src/or/circuitmux.c
+++ b/src/or/circuitmux.c
@@ -1092,8 +1092,11 @@ circuitmux_detach_circuit,(circuitmux_t *cmux, circuit_t *circ))
   /*
    * Use this to keep track of whether we found it for n_chan or
    * p_chan for consistency checking.
+   *
+   * The 0 initializer is not a valid cell_direction_t value.
+   * We assert that it has been replaced with a valid value before it is used.
    */
-  cell_direction_t last_searched_direction;
+  cell_direction_t last_searched_direction = 0;
 
   tor_assert(cmux);
   tor_assert(cmux->chanid_circid_map);
@@ -1123,6 +1126,9 @@ circuitmux_detach_circuit,(circuitmux_t *cmux, circuit_t *circ))
     }
   }
 
+  tor_assert(last_searched_direction == CELL_DIRECTION_OUT
+             || last_searched_direction == CELL_DIRECTION_IN);
+
   /*
    * If hashent isn't NULL, we have a circuit to detach; don't remove it from
    * the map until later of circuitmux_make_circuit_inactive() breaks.
diff --git a/src/or/connection.c b/src/or/connection.c
index 4d7cec7f9a..26ee4faf20 100644
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@ -1613,6 +1613,7 @@ connection_connect(connection_t *conn, const char *address,
     }
   }
 
+  tor_assert(options);
   if (options->ConstrainedSockets)
     set_constrained_socket_buffers(s, (int)options->ConstrainedSockSize);
 
diff --git a/src/or/control.c b/src/or/control.c
index b3a9dd693e..053c00b069 100644
--- a/src/or/control.c
+++ b/src/or/control.c
@@ -2639,7 +2639,7 @@ handle_control_attachstream(control_connection_t *conn, uint32_t len,
   /* Is this a single hop circuit? */
   if (circ && (circuit_get_cpath_len(circ)<2 || hop==1)) {
     const node_t *node = NULL;
-    char *exit_digest;
+    char *exit_digest = NULL;
     if (circ->build_state &&
         circ->build_state->chosen_exit &&
         !tor_digest_is_zero(circ->build_state->chosen_exit->identity_digest)) {
@@ -2654,6 +2654,7 @@ handle_control_attachstream(control_connection_t *conn, uint32_t len,
       "551 Can't attach stream to this one-hop circuit.\r\n", conn);
       return 0;
     }
+    tor_assert(exit_digest);
     ap_conn->chosen_exit_name = tor_strdup(hex_str(exit_digest, DIGEST_LEN));
   }
 
@@ -4921,7 +4922,7 @@ MOCK_IMPL(void,
                                             or_connection_t *or_conn))
 {
   int status = bootstrap_percent;
-  const char *tag, *summary;
+  const char *tag = "", *summary = "";
   char buf[BOOTSTRAP_MSG_LEN];
   const char *recommendation = "ignore";
   int severity;
diff --git a/src/or/dirvote.c b/src/or/dirvote.c
index 6f60e05b17..9ad92ca116 100644
--- a/src/or/dirvote.c
+++ b/src/or/dirvote.c
@@ -334,6 +334,9 @@ static int
 compare_vote_rs(const vote_routerstatus_t *a, const vote_routerstatus_t *b)
 {
   int r;
+  tor_assert(a);
+  tor_assert(b);
+
   if ((r = fast_memcmp(a->status.identity_digest, b->status.identity_digest,
                   DIGEST_LEN)))
     return r;
@@ -431,6 +434,7 @@ compute_routerstatus_consensus(smartlist_t *votes, int consensus_method,
     const tor_addr_port_t *most_alt_orport = NULL;
 
     SMARTLIST_FOREACH_BEGIN(votes, vote_routerstatus_t *, rs) {
+      tor_assert(rs);
       if (compare_vote_rs(most, rs) == 0 &&
           !tor_addr_is_null(&rs->status.ipv6_addr)
           && rs->status.ipv6_orport) {
diff --git a/src/or/rephist.c b/src/or/rephist.c
index 7bc9e1ce12..2f8ebcb5b3 100644
--- a/src/or/rephist.c
+++ b/src/or/rephist.c
@@ -1570,7 +1570,7 @@ rep_hist_load_bwhist_state_section(bw_array_t *b,
   time_t start;
 
   uint64_t v, mv;
-  int i,ok,ok_m;
+  int i,ok,ok_m = 0;
   int have_maxima = s_maxima && s_values &&
     (smartlist_len(s_values) == smartlist_len(s_maxima));
 
diff --git a/src/or/routerparse.c b/src/or/routerparse.c
index bdf0809150..337ba57a5a 100644
--- a/src/or/routerparse.c
+++ b/src/or/routerparse.c
@@ -923,7 +923,7 @@ router_parse_list_from_string(const char **s, const char *eos,
 {
   routerinfo_t *router;
   extrainfo_t *extrainfo;
-  signed_descriptor_t *signed_desc;
+  signed_descriptor_t *signed_desc = NULL;
   void *elt;
   const char *end, *start;
   int have_extrainfo;
@@ -980,6 +980,7 @@ router_parse_list_from_string(const char **s, const char *eos,
       continue;
     }
     if (saved_location != SAVED_NOWHERE) {
+      tor_assert(signed_desc);
       signed_desc->saved_location = saved_location;
       signed_desc->saved_offset = *s - start;
     }