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patch: fix CVE-2019-20633

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* CVE detail: https://nvd.nist.gov/vuln/detail/CVE-2019-20633

* upstream tracking: https://savannah.gnu.org/bugs/index.php?56683

* Fixes potential for double free after incomplete fix for CVE-2018-6952
  - src/pch.c (another_hunk): Avoid invalid memory access in context format
    diffs.

(From OE-Core rev: be71dd2cc16a4c0d244a76a748f08ca0d9bfeba0)

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Murray
2020-12-30 17:44:18 -05:00
committed by Richard Purdie
parent d61e6e87aa
commit 897a7d5679
2 changed files with 32 additions and 0 deletions
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31
meta/recipes-devtools/patch/patch/CVE-2019-20633.patch Normal file
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@@ -0,0 +1,31 @@
From 15b158db3ae11cb835f2eb8d2eb48e09d1a4af48 Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruen@gnu.org>
Date: Mon, 15 Jul 2019 19:10:02 +0200
Subject: Avoid invalid memory access in context format diffs
* src/pch.c (another_hunk): Avoid invalid memory access in context format
diffs.
CVE: CVE-2019-20633
Upstream-Status: Backport[https://git.savannah.gnu.org/cgit/patch.git/patch/?id=15b158db3ae11cb835f2eb8d2eb48e09d1a4af48]
Signed-off-by: Scott Murray <scott.murray@konsulko.com>
---
src/pch.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/pch.c b/src/pch.c
index a500ad9..cb54e03 100644
--- a/src/pch.c
+++ b/src/pch.c
@@ -1328,6 +1328,7 @@ another_hunk (enum diff difftype, bool rev)
ptrn_prefix_context = context;
ptrn_suffix_context = context;
if (repl_beginning
+ || p_end <= 0
|| (p_end
!= p_ptrn_lines + 1 + (p_Char[p_end - 1] == '\n')))
{
--
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