File CVE-2023-30608-ReDOS-parser.patch of Package python3-sqlparse

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File CVE-2023-30608-ReDOS-parser.patch of Package python3-sqlparse

From c457abd5f097dd13fb21543381e7cfafe7d31cfb Mon Sep 17 00:00:00 2001
From: Andi Albrecht <albrecht.andi@gmail.com>
Date: Mon, 20 Mar 2023 08:33:46 +0100
Subject: [PATCH] Remove unnecessary parts in regex for bad escaping.

The regex tried to deal with situations where escaping in the
SQL to be parsed was suspicious.
---
 CHANGELOG            |   12 ++++++++++++
 sqlparse/keywords.py |    4 ++--
 tests/test_split.py  |    4 ++--
 3 files changed, 16 insertions(+), 4 deletions(-)

--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,15 @@
+Additional notable changes
+--------------------------
+
+* IMPORTANT: This release fixes a security vulnerability in the
+  parser where a regular expression vulnerable to ReDOS (Regular
+  Expression Denial of Service) was used. See the security advisory
+  for details:
+  https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-rrm6-wvj7-cwh2
+  (and CVE-2023-30608) The vulnerability was discovered by
+  @erik-krogh from GitHub Security Lab (GHSL). Thanks for
+  reporting!
+
 Release 0.4.2 (Sep 10, 2021)
 ----------------------------
 
--- a/sqlparse/keywords.py
+++ b/sqlparse/keywords.py
@@ -66,9 +66,9 @@ SQL_REGEX = {
         (r'(?![_A-ZÀ-Ü])-?(\d+(\.\d*)|\.\d+)(?![_A-ZÀ-Ü])',
          tokens.Number.Float),
         (r'(?![_A-ZÀ-Ü])-?\d+(?![_A-ZÀ-Ü])', tokens.Number.Integer),
-        (r"'(''|\\\\|\\'|[^'])*'", tokens.String.Single),
+        (r"'(''|\\'|[^'])*'", tokens.String.Single),
         # not a real string literal in ANSI SQL:
-        (r'"(""|\\\\|\\"|[^"])*"', tokens.String.Symbol),
+        (r'"(""|\\"|[^"])*"', tokens.String.Symbol),
         (r'(""|".*?[^\\]")', tokens.String.Symbol),
         # sqlite names can be escaped with [square brackets]. left bracket
         # cannot be preceded by word character or a right bracket --
--- a/tests/test_split.py
+++ b/tests/test_split.py
@@ -18,8 +18,8 @@ def test_split_semicolon():
 
 
 def test_split_backslash():
-    stmts = sqlparse.parse(r"select '\\'; select '\''; select '\\\'';")
-    assert len(stmts) == 3
+    stmts = sqlparse.parse("select '\'; select '\'';")
+    assert len(stmts) == 2
 
 
 @pytest.mark.parametrize('fn', ['function.sql',

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