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GET /api/patches/2218715/?format=api
{ "id": 2218715, "url": "http://patchwork.ozlabs.org/api/patches/2218715/?format=api", "web_url": "http://patchwork.ozlabs.org/project/openvswitch/patch/20260401190350.443082-1-aconole@redhat.com/", "project": { "id": 47, "url": "http://patchwork.ozlabs.org/api/projects/47/?format=api", "name": "Open vSwitch", "link_name": "openvswitch", "list_id": "ovs-dev.openvswitch.org", "list_email": "ovs-dev@openvswitch.org", "web_url": "http://openvswitch.org/", "scm_url": "git@github.com:openvswitch/ovs.git", "webscm_url": "https://github.com/openvswitch/ovs", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260401190350.443082-1-aconole@redhat.com>", "list_archive_url": null, "date": "2026-04-01T19:03:50", "name": "[ovs-dev,v2] checkpatch.py: Fix a catastrophic backtracking issue.", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "833cb773f76886ddb706f0f66938a621f7d480d3", "submitter": { "id": 67184, "url": "http://patchwork.ozlabs.org/api/people/67184/?format=api", "name": "Aaron Conole", "email": "aconole@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/openvswitch/patch/20260401190350.443082-1-aconole@redhat.com/mbox/", "series": [ { "id": 498378, "url": "http://patchwork.ozlabs.org/api/series/498378/?format=api", "web_url": "http://patchwork.ozlabs.org/project/openvswitch/list/?series=498378", "date": "2026-04-01T19:03:50", "name": "[ovs-dev,v2] checkpatch.py: Fix a catastrophic backtracking issue.", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/498378/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2218715/comments/", "check": "success", "checks": "http://patchwork.ozlabs.org/api/patches/2218715/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<ovs-dev-bounces@openvswitch.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "dev@openvswitch.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "ovs-dev@lists.linuxfoundation.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=fajktUTm;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=openvswitch.org\n (client-ip=2605:bc80:3010::137; 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Wed, 1 Apr 2026 19:03:51 +0000 (UTC)" ], "X-Virus-Scanned": [ "amavis at osuosl.org", "amavis at osuosl.org" ], "X-Comment": "SPF check N/A for local connections - client-ip=140.211.9.56;\n helo=lists.linuxfoundation.org;\n envelope-from=ovs-dev-bounces@openvswitch.org; receiver=<UNKNOWN> ", "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 smtp4.osuosl.org 1756E41E17", "OpenDKIM Filter v2.11.0 smtp4.osuosl.org E279141E17" ], "Received-SPF": "Pass (mailfrom) identity=mailfrom; client-ip=170.10.129.124;\n helo=us-smtp-delivery-124.mimecast.com; envelope-from=aconole@redhat.com;\n receiver=<UNKNOWN>", "DMARC-Filter": "OpenDMARC Filter v1.4.2 smtp4.osuosl.org E279141E17", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1775070234;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=+puEMX86LnlEBGsXdj0E1E5AE/GyNJKSE794MmyiH0A=;\n b=fajktUTmOxmqSsDTQhUy9nsFZfD7OuDyxita4V7rt1BFFoafIAGcbiKqmuHGT1a/a4P25H\n UtM+OqcXtTIXRHFZI+5fbkCNwqXwC/bwfzkwPisWSk//Fn0K8QbsZehaVwqjvBhOBAkzTj\n EnUFQZyckbjxoE4evD7GT/DmG03dQmc=", "X-MC-Unique": "P6SoNxpUOi2CReOjpcET2Q-1", "X-Mimecast-MFC-AGG-ID": "P6SoNxpUOi2CReOjpcET2Q_1775070231", "To": "dev@openvswitch.org", "Date": "Wed, 1 Apr 2026 15:03:50 -0400", "Message-ID": "<20260401190350.443082-1-aconole@redhat.com>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "JUDzGZY4k0qNHB1IlAdY_aRLWqZifOCaEuY2j4WXsIc_1775070231", "X-Mimecast-Originator": "redhat.com", "Subject": "[ovs-dev] [PATCH v2] checkpatch.py: Fix a catastrophic backtracking\n issue.", "X-BeenThere": "ovs-dev@openvswitch.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "<ovs-dev.openvswitch.org>", "List-Unsubscribe": "<https://mail.openvswitch.org/mailman/options/ovs-dev>,\n <mailto:ovs-dev-request@openvswitch.org?subject=unsubscribe>", "List-Archive": "<http://mail.openvswitch.org/pipermail/ovs-dev/>", "List-Post": "<mailto:ovs-dev@openvswitch.org>", "List-Help": "<mailto:ovs-dev-request@openvswitch.org?subject=help>", "List-Subscribe": "<https://mail.openvswitch.org/mailman/listinfo/ovs-dev>,\n <mailto:ovs-dev-request@openvswitch.org?subject=subscribe>", "From": "Aaron Conole via dev <ovs-dev@openvswitch.org>", "Reply-To": "Aaron Conole <aconole@redhat.com>", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Errors-To": "ovs-dev-bounces@openvswitch.org", "Sender": "\"dev\" <ovs-dev-bounces@openvswitch.org>" }, "content": "The regex_if_macros accidentally implements a catastrophic backtracking\ncase during matching because it forces a greedy match and evaluation that\ncauses an explosion of combinations depending on how many blocks appear\nin a parenthesized expression.\n\nConsider an expression like:\n\n if (a b c d e f g h i j k) {\n\nThe regex engine will have to create an exponential number of matches that\ncan overload memory and cpu requirements.\n\nFix this by switching the inner-content match to use a non-greedy approach.\n\nFixes: aacad8685e3d (\"checkpatch: Fix regexp for if, while, etc inside macros.\")\nSigned-off-by: Aaron Conole <aconole@redhat.com>\n---\nv1->v2: The original proposed fix was requiring a second non-whitespace\n character, which caused 'the if (a) { ' case to fail due to the\n non-greedy match swallowing the closing paren and failing the\n match. Now make second non-greedy group as optional.\n\n utilities/checkpatch.py | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)", "diff": "diff --git a/utilities/checkpatch.py b/utilities/checkpatch.py\nindex 38d6f02c79..d18a8aacff 100755\n--- a/utilities/checkpatch.py\n+++ b/utilities/checkpatch.py\n@@ -158,7 +158,7 @@ __regex_has_xxx_mark = re.compile(r'.*xxx.*', re.IGNORECASE)\n __regex_added_doc_rst = re.compile(\n r'\\ndiff .*Documentation/.*rst\\nnew file mode')\n __regex_empty_return = re.compile(r'\\s*return;')\n-__regex_if_macros = re.compile(r'^ +(%s) \\([\\S]([\\s\\S]+[\\S])*\\) { +\\\\' %\n+__regex_if_macros = re.compile(r'^ +(%s) \\([\\S](?:[\\s\\S]*?[\\S])?\\) { +\\\\' %\n __parenthesized_constructs)\n __regex_nonascii_characters = re.compile(\"[^\\u0000-\\u007f]\")\n __regex_efgrep = re.compile(r'.*[ef]grep.*$')\n", "prefixes": [ "ovs-dev", "v2" ] }