ruby/ruby-3.0.0-Fixed-dangling-imemo_tmpbuf.patch

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From f690eb34e28b000627e5f0649dd81a04e252286f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sat, 2 Jan 2021 12:11:52 +0900
Subject: [PATCH] Fixed dangling imemo_tmpbuf
The count of rb_alloc_tmp_buffer_with_count is the allocation size
counted in VALUE size but not in the requested element size.
Co-authored-by: Yusuke Endoh <mame@ruby-lang.org>
Co-authored-by: Koichi Sasada <ko1@atdot.net>
---
include/ruby/internal/memory.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/include/ruby/internal/memory.h b/include/ruby/internal/memory.h
index 974c21e19ce8..7d24df494512 100644
--- a/include/ruby/internal/memory.h
+++ b/include/ruby/internal/memory.h
@@ -250,8 +250,9 @@ rbimpl_size_mul_or_raise(size_t x, size_t y)
static inline void *
rb_alloc_tmp_buffer2(volatile VALUE *store, long count, size_t elsize)
{
- return rb_alloc_tmp_buffer_with_count(
- store, rbimpl_size_mul_or_raise(count, elsize), count);
+ const size_t total_size = rbimpl_size_mul_or_raise(count, elsize);
+ const size_t cnt = (total_size + sizeof(VALUE) - 1) / sizeof(VALUE);
+ return rb_alloc_tmp_buffer_with_count(store, total_size, cnt);
}
#ifndef __MINGW32__