From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 64409C43217 for ; Tue, 5 Apr 2022 11:45:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1378898AbiDELjm (ORCPT ); Tue, 5 Apr 2022 07:39:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46824 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244718AbiDEIwf (ORCPT ); Tue, 5 Apr 2022 04:52:35 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F11F515718; Tue, 5 Apr 2022 01:42:31 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id AF41EB81C14; Tue, 5 Apr 2022 08:42:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D9FE3C385A1; Tue, 5 Apr 2022 08:42:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649148149; bh=YFr4/nojKaAOU/ZZjc5sHloKXZS8yH7kQ2huS/c3kYc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dpGk3jeWY+cewBcUP4BRF3NZRPQlbE9XssvjxwanlUA04N/OS45P+B/MqNF7or1re RjnD6iaLTSI5LzBktp9ekXcz+Kf3pTYwNZEbqa6Bja/d/EVl7mM2d/kUr/5ApoVfc1 nKKxGTnimpdNyZvaIsAgOOvRHWXAUckNF1qL3ano= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jianglei Nie , Herbert Xu , Sasha Levin Subject: [PATCH 5.16 0251/1017] crypto: ccree - Fix use after free in cc_cipher_exit() Date: Tue, 5 Apr 2022 09:19:24 +0200 Message-Id: <20220405070401.712674946@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070354.155796697@linuxfoundation.org> References: <20220405070354.155796697@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jianglei Nie [ Upstream commit 3d950c34074ed74d2713c3856ba01264523289e6 ] kfree_sensitive(ctx_p->user.key) will free the ctx_p->user.key. But ctx_p->user.key is still used in the next line, which will lead to a use after free. We can call kfree_sensitive() after dev_dbg() to avoid the uaf. Fixes: 63ee04c8b491 ("crypto: ccree - add skcipher support") Signed-off-by: Jianglei Nie Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/ccree/cc_cipher.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/crypto/ccree/cc_cipher.c b/drivers/crypto/ccree/cc_cipher.c index 78833491f534..309da6334a0a 100644 --- a/drivers/crypto/ccree/cc_cipher.c +++ b/drivers/crypto/ccree/cc_cipher.c @@ -257,8 +257,8 @@ static void cc_cipher_exit(struct crypto_tfm *tfm) &ctx_p->user.key_dma_addr); /* Free key buffer in context */ - kfree_sensitive(ctx_p->user.key); dev_dbg(dev, "Free key buffer in context. key=@%p\n", ctx_p->user.key); + kfree_sensitive(ctx_p->user.key); } struct tdes_keys { -- 2.34.1