From patchwork Tue Jan 12 16:10:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= X-Patchwork-Id: 12020139 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1C00EC4332B for ; Tue, 12 Jan 2021 16:13:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3B4523121 for ; Tue, 12 Jan 2021 16:12:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392201AbhALQMu (ORCPT ); Tue, 12 Jan 2021 11:12:50 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:41208 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387818AbhALQMu (ORCPT ); Tue, 12 Jan 2021 11:12:50 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1610467884; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=7GrmVz3g5PnC6MejB1/FJv7gDiKaAZjfigOkKnsP7RY=; b=LLN8ZYwXSFayWYvLsqT6Fl+TbNI8NYdcWl0hTMdwZ9zDQrGWTVZYltAKncIyCKpJ13gqaI g7qR3HZ93X9RA2bhk3kXKxOj13g4Z0u2oEAw3awJWG7hPHsYmvRvLUl+eRb6nYZTbxd6bU LH3T/tnqP/FPFRAqQf+4kRBE1QQDhcU= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-390-YckKDQlYMQifQvXXoU1vaw-1; Tue, 12 Jan 2021 11:11:21 -0500 X-MC-Unique: YckKDQlYMQifQvXXoU1vaw-1 Received: by mail-wr1-f70.google.com with SMTP id z8so1370383wrh.5 for ; Tue, 12 Jan 2021 08:11:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=7GrmVz3g5PnC6MejB1/FJv7gDiKaAZjfigOkKnsP7RY=; b=p6vYkQoSXlosLjr4RXYMaDYlhX4rbOKeOe7c9CyQPTN8DhJTc5zfOUy/0LDi2Evs5W bYrrKqfO0wZNpvd3ib7Svsmdij09nPnfKo3tkEP4LfLMjZejAZGFZL13N5lWp+hw/fyE ekaaXCPr6FTMOkNhneSOSoKGo3ELFp5wbzTKmNV6TtxLLPRf/g0CKUcw3mTtiVErpnD2 0Fn4dHnt/DoSQAiuY2qFQpLgDJHdckjIoMLAbMkMy5jO0PTvrDlYDAAjytEiHLHTW8n9 kx8qaLtpMUBCoQeAacB/F5btFjig48FR7bfj/E/9ByHxFC6SabjxJm0+RiNdpqgL8kG0 F7bg== X-Gm-Message-State: AOAM530SSUMiw/mwJV2n4OEX132EAfhUWv8kx77pH/mBwYvxS37KgR8S V8Q+mZF3SkFFhUYjookSjzrVj9IgUdkvPMjV6+m5d21Bb0paWy5OYuPIPRo28WGgK7RadFBNssb Gfu3MVZdBBzAPHrInO2Y= X-Received: by 2002:a1c:7d94:: with SMTP id y142mr4317088wmc.105.1610467879455; Tue, 12 Jan 2021 08:11:19 -0800 (PST) X-Google-Smtp-Source: ABdhPJy9gtHso6LQWZ01xitLmZ7DVGmvVKcp38eals66lkxaBqWRIlrF6/TqEJ1hfzciMThkNCz2Iw== X-Received: by 2002:a1c:7d94:: with SMTP id y142mr4317069wmc.105.1610467879236; Tue, 12 Jan 2021 08:11:19 -0800 (PST) Received: from alrua-x1.borgediget.toke.dk ([45.145.92.2]) by smtp.gmail.com with ESMTPSA id e15sm5765658wrx.86.2021.01.12.08.11.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Jan 2021 08:11:18 -0800 (PST) Received: by alrua-x1.borgediget.toke.dk (Postfix, from userid 1000) id 2A2DF180322; Tue, 12 Jan 2021 17:11:17 +0100 (CET) From: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= To: David Howells , Herbert Xu , "David S. Miller" Cc: =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Tianjia Zhang , Gilad Ben-Yossef , keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] crypto: public_key: check that pkey_algo is non-NULL before passing it to strcmp() Date: Tue, 12 Jan 2021 17:10:44 +0100 Message-Id: <20210112161044.3101-1-toke@redhat.com> X-Mailer: git-send-email 2.30.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: keyrings@vger.kernel.org When public_key_verify_signature() is called from asymmetric_key_verify_signature(), the pkey_algo field of struct public_key_signature will be NULL, which causes a NULL pointer dereference in the strcmp() check. Fix this by adding a NULL check. One visible manifestation of this is that userspace programs (such as the 'iwd' WiFi daemon) will be killed when trying to verify a TLS key using the keyctl(2) interface. Cc: stable@vger.kernel.org Fixes: 215525639631 ("X.509: support OSCCA SM2-with-SM3 certificate verification") Signed-off-by: Toke Høiland-Jørgensen Reviewed-by: Toke Høiland-Jørgensen Tested-by: Toke Høiland-Jørgensen Reviewed-by: Jarkko Sakkinen Tested-by: João Fonseca --- crypto/asymmetric_keys/public_key.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/crypto/asymmetric_keys/public_key.c b/crypto/asymmetric_keys/public_key.c index 8892908ad58c..35b09e95a870 100644 --- a/crypto/asymmetric_keys/public_key.c +++ b/crypto/asymmetric_keys/public_key.c @@ -356,7 +356,7 @@ int public_key_verify_signature(const struct public_key *pkey, if (ret) goto error_free_key; - if (strcmp(sig->pkey_algo, "sm2") == 0 && sig->data_size) { + if (sig->pkey_algo && strcmp(sig->pkey_algo, "sm2") == 0 && sig->data_size) { ret = cert_sig_digest_update(sig, tfm); if (ret) goto error_free_key;