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 CA3B4C433EF for ; Fri, 25 Mar 2022 15:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376557AbiCYP1F (ORCPT ); Fri, 25 Mar 2022 11:27:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42660 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376893AbiCYPXa (ORCPT ); Fri, 25 Mar 2022 11:23:30 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE31F931AC; Fri, 25 Mar 2022 08:16:58 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 02CA360ABA; Fri, 25 Mar 2022 15:16:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1238EC340E9; Fri, 25 Mar 2022 15:16:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1648221403; bh=/nQyJ9yza8EvDjTUufYTyMFLKSsxxl3K2gQ/ytm00+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mfxPzao/NFdDlTug1ohXNvyvKOYGlGak+oes/U26G8NQQhESo1vsQDBGk5CRmX7yO IYLVzAi21D4yNQoRRS9tcweFL2zCZ39KRF5IaEK+AQ3OhqM+PE+jI4bmBM9etYyn7c 9X2qOiRp0WR6KLsyiPWbQsu5G0ZFvXW041HLlaKU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jordy Zomer , Krzysztof Kozlowski , "David S. Miller" , Denis Efremov Subject: [PATCH 5.16 12/37] nfc: st21nfca: Fix potential buffer overflows in EVT_TRANSACTION Date: Fri, 25 Mar 2022 16:14:22 +0100 Message-Id: <20220325150420.399016057@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220325150420.046488912@linuxfoundation.org> References: <20220325150420.046488912@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: stable@vger.kernel.org From: Jordy Zomer commit 4fbcc1a4cb20fe26ad0225679c536c80f1648221 upstream. It appears that there are some buffer overflows in EVT_TRANSACTION. This happens because the length parameters that are passed to memcpy come directly from skb->data and are not guarded in any way. Signed-off-by: Jordy Zomer Reviewed-by: Krzysztof Kozlowski Signed-off-by: David S. Miller Signed-off-by: Denis Efremov Signed-off-by: Greg Kroah-Hartman --- drivers/nfc/st21nfca/se.c | 10 ++++++++++ 1 file changed, 10 insertions(+) --- a/drivers/nfc/st21nfca/se.c +++ b/drivers/nfc/st21nfca/se.c @@ -316,6 +316,11 @@ int st21nfca_connectivity_event_received return -ENOMEM; transaction->aid_len = skb->data[1]; + + /* Checking if the length of the AID is valid */ + if (transaction->aid_len > sizeof(transaction->aid)) + return -EINVAL; + memcpy(transaction->aid, &skb->data[2], transaction->aid_len); @@ -325,6 +330,11 @@ int st21nfca_connectivity_event_received return -EPROTO; transaction->params_len = skb->data[transaction->aid_len + 3]; + + /* Total size is allocated (skb->len - 2) minus fixed array members */ + if (transaction->params_len > ((skb->len - 2) - sizeof(struct nfc_evt_transaction))) + return -EINVAL; + memcpy(transaction->params, skb->data + transaction->aid_len + 4, transaction->params_len);