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From 1a6ff0beebf0ab0c71081eaff1d5d7fd26015a94 Mon Sep 17 00:00:00 2001
From: Josef 'Jeff' Sipek <jeff.sipek@dovecot.fi>
Date: Tue, 19 Sep 2017 13:26:57 +0300
Subject: [PATCH] lib: buffer_free(NULL) should be a no-op
---
src/lib/buffer.c | 3 +++
1 file changed, 3 insertions(+)
Signed-off-by: Sana Kazi <Sana.Kazi@kpit.com>
CVE: CVE-2020-12100
Upstream-Status: Backport [http://archive.ubuntu.com/ubuntu/pool/main/d/dovecot/dovecot_2.2.33.2-1ubuntu4.7.debian.tar.xz]
Comment: No change in any hunk
--- a/src/lib/buffer.c
+++ b/src/lib/buffer.c
@@ -148,6 +148,9 @@ void buffer_free(buffer_t **_buf)
{
struct real_buffer *buf = (struct real_buffer *)*_buf;
+ if (buf == NULL)
+ return;
+
*_buf = NULL;
if (buf->alloced)
p_free(buf->pool, buf->w_buffer);
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