From 4b53a29eb26716592ef2f00f925ef58ccb182e61 Mon Sep 17 00:00:00 2001
From: Stepan Koltsov <stepan.koltsov@gmail.com>
Date: Wed, 20 Aug 2025 10:57:49 +0100
Subject: [PATCH] Tweak BytesMut::remaining_mut (#795)

---
 src/bytes_mut.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bytes_mut.rs b/src/bytes_mut.rs
index d8d04d3..333a0ae 100644
--- a/src/bytes_mut.rs
+++ b/src/bytes_mut.rs
@@ -1170,7 +1170,8 @@ impl Buf for BytesMut {
 unsafe impl BufMut for BytesMut {
     #[inline]
     fn remaining_mut(&self) -> usize {
-        usize::MAX - self.len()
+        // Max allocation size is isize::MAX.
+        isize::MAX as usize - self.len()
     }
 
     #[inline]