From patchwork Fri Jul 21 17:00:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 13322380 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 5BA4DC001DE for ; Fri, 21 Jul 2023 17:00:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230499AbjGURAY (ORCPT ); Fri, 21 Jul 2023 13:00:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230463AbjGURAW (ORCPT ); Fri, 21 Jul 2023 13:00:22 -0400 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E7AC2D53; Fri, 21 Jul 2023 10:00:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1689958820; x=1721494820; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=FZ6LKlQ1eKLJzZ117OvZPucOMpZOmzPiCLf/Siw2rWo=; b=OlfaOZQqD7SWfDs2krTBGODU2UjugIcq7tBkmsIQTPkSeb4+Urfg7U1a Gu9aQWakytlcSaQacR5cFqEJ/gBjHuHBp82lI9UNdXBgshKhNufyBQukq gEZXAYDJBuPK8rsHStQmakgW+B1hkNSdQTaQxR4e55TL14AhIsko+KcGI wlz6j6iZgzYEEPZbZo7EoZvhCUbe6zfscA0tj89QUa8iwHifpSkT6hipF 21Mwx3rH9QEvHU9vElG1YSoI1i0o05Qm5s0/n/GAPCYsmBzqV1ykexyIE C+khHwaJnbzbYBCEHonvOXpW73n+zU4PGBZ3uwjm8v26xllpFIIcWDTB+ Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10778"; a="369739454" X-IronPort-AV: E=Sophos;i="6.01,222,1684825200"; d="scan'208";a="369739454" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jul 2023 10:00:17 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10778"; a="754540194" X-IronPort-AV: E=Sophos;i="6.01,222,1684825200"; d="scan'208";a="754540194" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga008.jf.intel.com with ESMTP; 21 Jul 2023 10:00:15 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 4CD74370; Fri, 21 Jul 2023 20:00:23 +0300 (EEST) From: Andy Shevchenko To: Andy Shevchenko , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jonathan Cameron , Lars-Peter Clausen , Nuno Sa Subject: [PATCH v2 3/8] iio: core: Switch to krealloc_array() Date: Fri, 21 Jul 2023 20:00:17 +0300 Message-Id: <20230721170022.3461-4-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.40.0.1.gaa8946217a0b In-Reply-To: <20230721170022.3461-1-andriy.shevchenko@linux.intel.com> References: <20230721170022.3461-1-andriy.shevchenko@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Let the krealloc_array() copy the original data and check for a multiplication overflow. Signed-off-by: Andy Shevchenko Reviewed-by: Nuno Sa --- drivers/iio/industrialio-core.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 4e45740331ee..6e28c2a3d223 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1465,7 +1465,7 @@ int iio_device_register_sysfs_group(struct iio_dev *indio_dev, const struct attribute_group **new, **old = iio_dev_opaque->groups; unsigned int cnt = iio_dev_opaque->groupcounter; - new = krealloc(old, sizeof(*new) * (cnt + 2), GFP_KERNEL); + new = krealloc_array(old, cnt + 2, sizeof(*new), GFP_KERNEL); if (!new) return -ENOMEM; @@ -1483,13 +1483,13 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev) { struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); int i, ret = 0, attrcount, attrn, attrcount_orig = 0; + struct attribute **attrs, **attr, *clk = NULL; struct iio_dev_attr *p; - struct attribute **attr, *clk = NULL; /* First count elements in any existing group */ - if (indio_dev->info->attrs) { - attr = indio_dev->info->attrs->attrs; - while (*attr++ != NULL) + attrs = indio_dev->info->attrs ? indio_dev->info->attrs->attrs : NULL; + if (attrs) { + for (attr = attrs; *attr; attr++) attrcount_orig++; } attrcount = attrcount_orig; @@ -1521,20 +1521,14 @@ static int iio_device_register_sysfs(struct iio_dev *indio_dev) if (clk) attrcount++; + /* Copy across original attributes, and point to original binary attributes */ iio_dev_opaque->chan_attr_group.attrs = - kcalloc(attrcount + 1, - sizeof(iio_dev_opaque->chan_attr_group.attrs[0]), - GFP_KERNEL); + krealloc_array(attrs, attrcount + 1, sizeof(*attrs), GFP_KERNEL); if (iio_dev_opaque->chan_attr_group.attrs == NULL) { ret = -ENOMEM; goto error_clear_attrs; } - /* Copy across original attributes, and point to original binary attributes */ if (indio_dev->info->attrs) { - memcpy(iio_dev_opaque->chan_attr_group.attrs, - indio_dev->info->attrs->attrs, - sizeof(iio_dev_opaque->chan_attr_group.attrs[0]) - *attrcount_orig); iio_dev_opaque->chan_attr_group.is_visible = indio_dev->info->attrs->is_visible; iio_dev_opaque->chan_attr_group.bin_attrs =