git.99rst.org Git - openwrt-packages.git/blob

   1 commit 000f227a4cfdb019575e889638f9e0e5a53bbb0b
   2 Author: Olivier Houchard <cognet@ci0.org>
   3 Date:   Mon Dec 30 18:15:40 2019 +0100
   4
   5     BUG/MEDIUM: connections: Hold the lock when wanting to kill a connection.
   6
   7     In connect_server(), when we decide we want to kill the connection of
   8     another thread because there are too many idle connections, hold the
   9     toremove_lock of the corresponding thread, othervise, there's a small race
  10     condition where we could try to add the connection to the toremove_connections
  11     list while it has already been free'd.
  12
  13     This should be backported to 2.0 and 2.1.
  14
  15     (cherry picked from commit 140237471e408736bb7162e68c572c710a66a526)
  16     Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
  17
  18 diff --git a/src/backend.c b/src/backend.c
  19 index ebc5050cb..be081a5e1 100644
  20 --- a/src/backend.c
  21 +++ b/src/backend.c
  22 @@ -1295,6 +1295,7 @@ int connect_server(struct stream *s)
  23                                 // see it possibly larger.
  24                                 ALREADY_CHECKED(i);
  25
  26 +                               HA_SPIN_LOCK(OTHER_LOCK, &toremove_lock[tid]);
  27                                 tokill_conn = MT_LIST_POP(&srv->idle_orphan_conns[i],
  28                                     struct connection *, list);
  29                                 if (tokill_conn) {
  30 @@ -1305,6 +1306,7 @@ int connect_server(struct stream *s)
  31                                         task_wakeup(idle_conn_cleanup[i], TASK_WOKEN_OTHER);
  32                                         break;
  33                                 }
  34 +                               HA_SPIN_UNLOCK(OTHER_LOCK, &toremove_lock[tid]);
  35                         }
  36                 }
  37