From 7341a4fc07ec8f12ff25538d39383ecf68a5f852 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Fri, 6 Dec 2024 15:08:24 -0500
Subject: [PATCH] [Bug #20933] Fix IO::Buffer overlap calculation

The allocated buffers may be consecutive memory addresses. This will mean
that `b->base == a->base + a->size` even though `a` and `b` are separate
buffers.
---
 io_buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_buffer.c b/io_buffer.c
index 19c755474a..a4b7d30018 100644
--- a/io_buffer.c
+++ b/io_buffer.c
@@ -3395,7 +3395,7 @@ io_buffer_overlaps(const struct rb_io_buffer *a, const struct rb_io_buffer *b)
         return io_buffer_overlaps(b, a);
     }
 
-    return (b->base >= a->base) && (b->base <= (void*)((unsigned char *)a->base + a->size));
+    return (b->base >= a->base) && (b->base < (void*)((unsigned char *)a->base + a->size));
 }
 
 static inline void