Fixed bug #29769 (sys_check_timeouts: sys_now() may overflow)

2026-05-20 07:06:53 +08:00 · 2010-05-04 19:27:42 +00:00
parent abc36471d9
commit 71f5fdef42
3 changed files with 11 additions and 2 deletions
--- a/src/core/timers.c
+++ b/src/core/timers.c
@@ -370,8 +370,8 @@ sys_check_timeouts(void)

  now = sys_now();
  if (next_timeout) {
-    /* @todo: wrap around? */
-    diff = now - timeouts_last_time;
+    /* this cares for wraparounds */
+    diff = LWIP_U32_DIFF(now, timeouts_last_time);
    do
    {
      had_one = 0;