From patchwork Tue May 11 10:06:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Zaidman X-Patchwork-Id: 435949 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 86A83C433ED for ; Tue, 11 May 2021 10:06:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5213F61360 for ; Tue, 11 May 2021 10:06:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231379AbhEKKH7 (ORCPT ); Tue, 11 May 2021 06:07:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231204AbhEKKH7 (ORCPT ); Tue, 11 May 2021 06:07:59 -0400 Received: from mail-wr1-x436.google.com (mail-wr1-x436.google.com [IPv6:2a00:1450:4864:20::436]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B570C061574; Tue, 11 May 2021 03:06:52 -0700 (PDT) Received: by mail-wr1-x436.google.com with SMTP id v12so19500819wrq.6; Tue, 11 May 2021 03:06:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=c2WVbfAVqJcL+REqbX0YpO9uYgKY9glSk3kcY+TpGLg=; b=CLuDvEpM3aoLoo6URBinpv+XxdSvKbVEhi+rM3DXkpBb1On2rr2Rc5Ryydipxns/7W J/BihtFNpBMPDUZXQpXLUQyuC+2M18/GY49sw6Mdg3kRFUGKPw6a8wP8DoKxDtlkU0Vv k7rbsUTq9iGHsSkGjUxRzg2NUdhyP3ZsCcdBygYutaKqVyAbn/Y5osGGsawJ8RvtNQrE p4XT4Q0oXppYPkKSSamfZz5tXbricf2cdPRkB8VgWlQb/ew4grrt0n6+NC+PEbsv5+XP MQjmWnV6HFdrZc4EXQpqgMuAMM/rnpW9JNhKaKgpMqh2FtvFo+UNoFvFsTgNj+mk86oQ iq3w== 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=c2WVbfAVqJcL+REqbX0YpO9uYgKY9glSk3kcY+TpGLg=; b=cSGhgKfsIlnrW6N4dMNwL6403YO3GHPvysmq6s6Nh7XdFEzJwPsiUWyWHzfn+52CbH G9gdFbfysrFrLdFOSpUYHpojAuuLMe6orDXc+wYcK8iHMyozlHLm7eHIkupSKnDy8OOL V/NmM4Y159k0KPSg3lryEAMtYWZR0fpPxQlblQRsrxT4mDpCtNePt+ZggMB/7hNH/9u4 +lNmD20A2XpSkZFdQlTJ9PkxVSD6GGO/gnyZdcnDmCJlo9oqV5/32y1BUuTF+FnKAmzV bpmeAS+ctAEGnsu6iRmT9bb73ox0XW6VjA8Cmcw5wSfWp2XMAhZXGyPVNZlEMrFnXFIG b0yw== X-Gm-Message-State: AOAM5321JyRyKRjFG/lLWIQbKrqV7KMehHyKUQ0kbocgug4Xg4mQwldb tp1wDX0vDbU/xW09BNyZO3E= X-Google-Smtp-Source: ABdhPJwhqZ4PpItyOqNGBZqT+MmWAkofsgKBZYJ9WwZj2DQHPHW3XZY472j3ptZBh1MvZIHYlBJS5A== X-Received: by 2002:adf:f7d2:: with SMTP id a18mr38324156wrq.198.1620727610765; Tue, 11 May 2021 03:06:50 -0700 (PDT) Received: from michael-VirtualBox.xsight.ent (cbl217-132-244-50.bb.netvision.net.il. [217.132.244.50]) by smtp.googlemail.com with ESMTPSA id 61sm30079581wrm.52.2021.05.11.03.06.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 May 2021 03:06:50 -0700 (PDT) From: Michael Zaidman To: trix@redhat.com, jikos@kernel.org, benjamin.tissoires@redhat.com Cc: linux-i2c@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Zaidman Subject: [PATCH v3] HID: ft260: improve error handling of ft260_hid_feature_report_get() Date: Tue, 11 May 2021 13:06:34 +0300 Message-Id: <20210511100634.16278-1-michael.zaidman@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Fixes: 6a82582d9fa4 ("HID: ft260: add usb hid to i2c host bridge driver") The ft260_hid_feature_report_get() checks if the return size matches the requested size. But the function can also fail with at least -ENOMEM. Add the < 0 checks. In ft260_hid_feature_report_get(), do not do the memcpy to the caller's buffer if there is an error. Fixes: 6a82582d9fa4 ("HID: ft260: add usb hid to i2c host bridge driver") Signed-off-by: Tom Rix --- v3 Simplify and optimize the changes --- v2: add unlikely()'s for error conditions --- Signed-off-by: Tom Rix Signed-off-by: Michael Zaidman --- drivers/hid/hid-ft260.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c index 047aa85a7c83..7f4cb823129e 100644 --- a/drivers/hid/hid-ft260.c +++ b/drivers/hid/hid-ft260.c @@ -249,7 +249,10 @@ static int ft260_hid_feature_report_get(struct hid_device *hdev, ret = hid_hw_raw_request(hdev, report_id, buf, len, HID_FEATURE_REPORT, HID_REQ_GET_REPORT); - memcpy(data, buf, len); + if (likely(ret == len)) + memcpy(data, buf, len); + else if (ret >= 0) + ret = -EIO; kfree(buf); return ret; } @@ -298,7 +301,7 @@ static int ft260_xfer_status(struct ft260_device *dev) ret = ft260_hid_feature_report_get(hdev, FT260_I2C_STATUS, (u8 *)&report, sizeof(report)); - if (ret < 0) { + if (unlikely(ret < 0)) { hid_err(hdev, "failed to retrieve status: %d\n", ret); return ret; } @@ -720,10 +723,9 @@ static int ft260_get_system_config(struct hid_device *hdev, ret = ft260_hid_feature_report_get(hdev, FT260_SYSTEM_SETTINGS, (u8 *)cfg, len); - if (ret != len) { + if (ret < 0) { hid_err(hdev, "failed to retrieve system status\n"); - if (ret >= 0) - return -EIO; + return ret; } return 0; } @@ -776,8 +778,8 @@ static int ft260_byte_show(struct hid_device *hdev, int id, u8 *cfg, int len, int ret; ret = ft260_hid_feature_report_get(hdev, id, cfg, len); - if (ret != len && ret >= 0) - return -EIO; + if (ret < 0) + return ret; return scnprintf(buf, PAGE_SIZE, "%hi\n", *field); } @@ -788,8 +790,8 @@ static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len, int ret; ret = ft260_hid_feature_report_get(hdev, id, cfg, len); - if (ret != len && ret >= 0) - return -EIO; + if (ret < 0) + return ret; return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field)); } @@ -940,10 +942,8 @@ static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id) ret = ft260_hid_feature_report_get(hdev, FT260_CHIP_VERSION, (u8 *)&version, sizeof(version)); - if (ret != sizeof(version)) { + if (ret < 0) { hid_err(hdev, "failed to retrieve chip version\n"); - if (ret >= 0) - ret = -EIO; goto err_hid_close; }