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 36293C001E0 for ; Tue, 1 Aug 2023 09:29:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232993AbjHAJ3n (ORCPT ); Tue, 1 Aug 2023 05:29:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58432 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232230AbjHAJ3V (ORCPT ); Tue, 1 Aug 2023 05:29:21 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4960D26B5 for ; Tue, 1 Aug 2023 02:28:06 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C449D614BB for ; Tue, 1 Aug 2023 09:28:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFDDCC433C8; Tue, 1 Aug 2023 09:28:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690882085; bh=iR1ZjivxWQ/a2FNRUrQbQdszLORLNbKkX/b3z71/6e4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=t653j4EFpCJe0aXCheAqo0WCGrRhm39oSyCmM2SwiJ+Xszx/pgNXcgkvLmD5UfZeX vkz1+59xZZ4uMv0gDq850Da7vECYN2akLNIQ0IzyzAHvUjMDT0STWEEHjWIIltyfSu EIBU/SX7jwbzh2LzMzWSkjx/3Q7lZWaII2iv+/NE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexander Steffen , Jarkko Sakkinen Subject: [PATCH 5.15 135/155] tpm_tis: Explicitly check for error code Date: Tue, 1 Aug 2023 11:20:47 +0200 Message-ID: <20230801091914.987714185@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801091910.165050260@linuxfoundation.org> References: <20230801091910.165050260@linuxfoundation.org> User-Agent: quilt/0.67 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: Alexander Steffen commit 513253f8c293c0c8bd46d09d337fc892bf8f9f48 upstream. recv_data either returns the number of received bytes, or a negative value representing an error code. Adding the return value directly to the total number of received bytes therefore looks a little weird, since it might add a negative error code to a sum of bytes. The following check for size < expected usually makes the function return ETIME in that case, so it does not cause too many problems in practice. But to make the code look cleaner and because the caller might still be interested in the original error code, explicitly check for the presence of an error code and pass that through. Cc: stable@vger.kernel.org Fixes: cb5354253af2 ("[PATCH] tpm: spacing cleanups 2") Signed-off-by: Alexander Steffen Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- drivers/char/tpm/tpm_tis_core.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -314,6 +314,7 @@ static int tpm_tis_recv(struct tpm_chip int size = 0; int status; u32 expected; + int rc; if (count < TPM_HEADER_SIZE) { size = -EIO; @@ -333,8 +334,13 @@ static int tpm_tis_recv(struct tpm_chip goto out; } - size += recv_data(chip, &buf[TPM_HEADER_SIZE], - expected - TPM_HEADER_SIZE); + rc = recv_data(chip, &buf[TPM_HEADER_SIZE], + expected - TPM_HEADER_SIZE); + if (rc < 0) { + size = rc; + goto out; + } + size += rc; if (size < expected) { dev_err(&chip->dev, "Unable to read remainder of result\n"); size = -ETIME;