[tor-commits] [tor] branch main updated: Revert "cmux: Don't pick a marked for close circuit as active"

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dgoulet pushed a commit to branch main
in repository tor.

The following commit(s) were added to refs/heads/main by this push:
     new 331204e100 Revert "cmux: Don't pick a marked for close circuit as active"
331204e100 is described below

commit 331204e1005b6e14cb28388a852c489c0638e539
Author: David Goulet <dgoulet at torproject.org>
AuthorDate: Thu Jun 23 10:55:56 2022 -0400

    Revert "cmux: Don't pick a marked for close circuit as active"
    
    This reverts commit 4f1298e4189f8bda8ecf48cf7ff25445698d747a.
---
 changes/ticket25312           |  3 ---
 src/core/or/circuitmux_ewma.c | 12 ++----------
 2 files changed, 2 insertions(+), 13 deletions(-)

diff --git a/changes/ticket25312 b/changes/ticket25312
deleted file mode 100644
index 5de1a48260..0000000000
--- a/changes/ticket25312
+++ /dev/null
@@ -1,3 +0,0 @@
-  o Minor bugfixes (circuit):
-    - Fix a tiny window where a circuit can be chosen as active but is marked
-      for close. Fixes bug 25312; bugfix on 0.2.4.4-alpha.
diff --git a/src/core/or/circuitmux_ewma.c b/src/core/or/circuitmux_ewma.c
index 18c726c9ba..adf256ab05 100644
--- a/src/core/or/circuitmux_ewma.c
+++ b/src/core/or/circuitmux_ewma.c
@@ -35,7 +35,6 @@
 #include <math.h>
 
 #include "core/or/or.h"
-#include "core/or/circuit_st.h"
 #include "core/or/circuitmux.h"
 #include "core/or/circuitmux_ewma.h"
 #include "lib/crypt_ops/crypto_rand.h"
@@ -383,17 +382,10 @@ ewma_pick_active_circuit(circuitmux_t *cmux,
 
   pol = TO_EWMA_POL_DATA(pol_data);
 
-  for (int i = 0; i < smartlist_len(pol->active_circuit_pqueue); i++) {
+  if (smartlist_len(pol->active_circuit_pqueue) > 0) {
     /* Get the head of the queue */
-    cell_ewma = smartlist_get(pol->active_circuit_pqueue, i);
+    cell_ewma = smartlist_get(pol->active_circuit_pqueue, 0);
     circ = cell_ewma_to_circuit(cell_ewma);
-    /* Don't send back closed circuit. This is possible because the circuit
-     * is detached from the cmux before the circuit gets freed and not when
-     * marked for close. Because of that, there is a window where a closed
-     * circuit can be picked here. See #25312. */
-    if (circ->marked_for_close) {
-      continue;
-    }
   }
 
   return circ;

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