From 47ed553fd5bebfc36eb8aa81686eeaa5a84eccac Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Thu, 8 Aug 2019 20:49:14 +0200
Subject: patch 8.1.1827: allocating more memory than needed for extended
 structs

Problem:    Allocating more memory than needed for extended structs.
Solution:   Use offsetof() instead of sizeof(). (Dominique Pelle,
            closes #4786)
---
 src/getchar.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src/getchar.c')

diff --git a/src/getchar.c b/src/getchar.c
index 4a3587c3f2..b0e72f58f2 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -232,7 +232,7 @@ add_buff(
 	    len = MINIMAL_SIZE;
 	else
 	    len = slen;
-	p = alloc(sizeof(buffblock_T) + len);
+	p = alloc(offsetof(buffblock_T, b_str) + len + 1);
 	if (p == NULL)
 	    return; /* no space, just forget it */
 	buf->bh_space = (int)(len - slen);
-- 
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