From 61c9fe44a3c31aaab14ec01c568ecf2f081e1bdf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
Date: Sat, 4 Dec 2021 20:22:51 +0100
Subject: CGroupUtils: avoid unsigned integer underflow

Do not underflow count at the last iteration, which triggers UBSAN when
using -fsanitize=unsigned-integer-overflow. This is useful as those
underflows can be a result of a flawed counting logic (e.g. a counter
gets reduced more than increased).
---
 linux/CGroupUtils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'linux')

diff --git a/linux/CGroupUtils.c b/linux/CGroupUtils.c
index 6f3b6fe7..765012d3 100644
--- a/linux/CGroupUtils.c
+++ b/linux/CGroupUtils.c
@@ -33,7 +33,7 @@ static bool StrBuf_putc_write(StrBuf_state* p, char c) {
 }
 
 static bool StrBuf_putsn(StrBuf_state* p, StrBuf_putc_t w, const char* s, size_t count) {
-   while (count--)
+   for (; count; count--)
       if (!w(p, *s++))
          return false;
 
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