From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gateway34.websitewelcome.com ([192.185.148.104]:24448 "EHLO gateway34.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750903AbdGGFQ1 (ORCPT ); Fri, 7 Jul 2017 01:16:27 -0400 Received: from cm12.websitewelcome.com (cm12.websitewelcome.com [100.42.49.8]) by gateway34.websitewelcome.com (Postfix) with ESMTP id 0E7621BC080 for ; Thu, 6 Jul 2017 23:53:12 -0500 (CDT) Date: Thu, 6 Jul 2017 23:53:11 -0500 From: "Gustavo A. R. Silva" To: Peter Rosin , Jonathan Cameron , Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] iio: multiplexer: add NULL check on devm_kzalloc() and devm_kmemdup() return values Message-ID: <20170707045311.GA4535@embeddedgus> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20170706235151.Horde.0bV02ctiQ59WNlX28lLjSHX@gator4166.hostgator.com> Sender: linux-iio-owner@vger.kernel.org List-Id: linux-iio@vger.kernel.org Check return values from call to devm_kzalloc() and devm_kmemup() in order to prevent a NULL pointer dereference. This issue was detected using Coccinelle and the following semantic patch: @@ expression x; identifier fld; @@ * x = devm_kzalloc(...); ... when != x == NULL x->fld Cc: Peter Rosin Signed-off-by: Gustavo A. R. Silva --- Changes in v2: Add NULL check on devm_kmemup() return value. drivers/iio/multiplexer/iio-mux.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/iio/multiplexer/iio-mux.c b/drivers/iio/multiplexer/iio-mux.c index 37ba007..74831fc 100644 --- a/drivers/iio/multiplexer/iio-mux.c +++ b/drivers/iio/multiplexer/iio-mux.c @@ -285,6 +285,9 @@ static int mux_configure_channel(struct device *dev, struct mux *mux, child->ext_info_cache = devm_kzalloc(dev, sizeof(*child->ext_info_cache) * num_ext_info, GFP_KERNEL); + if (!child->ext_info_cache) + return -ENOMEM; + for (i = 0; i < num_ext_info; ++i) { child->ext_info_cache[i].size = -1; @@ -309,6 +312,9 @@ static int mux_configure_channel(struct device *dev, struct mux *mux, child->ext_info_cache[i].data = devm_kmemdup(dev, page, ret + 1, GFP_KERNEL); + if (!child->ext_info_cache[i].data) + return -ENOMEM; + child->ext_info_cache[i].data[ret] = 0; child->ext_info_cache[i].size = ret; } -- 2.5.0