From 596f635b28cdecbee6f7a97b162b13f3640e88a8 Mon Sep 17 00:00:00 2001
From: Marius Vikhammer <marius.vikhammer@espressif.com>
Date: Mon, 19 Aug 2024 10:46:26 +0800
Subject: [PATCH] fix(newlib): fixed potential overflow in usleep

If trying to usleep for 0xFFFF FFFF us the calculation of delay ticks would overflow
resulting in the system not sleeping at all.

Closes https://github.com/espressif/esp-idf/issues/14390
---
 components/newlib/time.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/components/newlib/time.c b/components/newlib/time.c
index 4b9fc6ca8e..ce993e8f71 100644
--- a/components/newlib/time.c
+++ b/components/newlib/time.c
@@ -200,7 +200,10 @@ WEAK_UNLESS_TIMEFUNC_IMPL int settimeofday(const struct timeval *tv, const struc
 
 int usleep(useconds_t us)
 {
-    const int us_per_tick = portTICK_PERIOD_MS * 1000;
+    /* Even at max tick rate, vTaskDelay can still delay for the max of the us argument,
+       we just need to make sure the tick calculation does not overflow
+    */
+    const int64_t us_per_tick = portTICK_PERIOD_MS * 1000;
     if (us < us_per_tick) {
         esp_rom_delay_us((uint32_t) us);
     } else {