From 0a2c43af8811fecf6fd08379f16571594bcbb738 Mon Sep 17 00:00:00 2001
From: Jiahao XU <Jiahao_XU@outlook.com>
Date: Thu, 28 Apr 2022 19:37:33 +1000
Subject: Fix bugs in `BytesMut::reserve_inner` (#544)

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

(limited to 'src')

diff --git a/src/bytes_mut.rs b/src/bytes_mut.rs
index 88d7f00..cc1a3ba 100644
--- a/src/bytes_mut.rs
+++ b/src/bytes_mut.rs
@@ -646,7 +646,7 @@ impl BytesMut {
                     self.cap = v.capacity();
                 } else {
                     // calculate offset
-                    let off = v.capacity() - self.cap;
+                    let off = (self.ptr.as_ptr() as usize) - (v.as_ptr() as usize);
 
                     // new_cap is calculated in terms of `BytesMut`, not the underlying
                     // `Vec`, so it does not take the offset into account.
-- 
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