From patchwork Fri Jun 10 08:45:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nuno Sa X-Patchwork-Id: 12876943 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C3197C for ; Fri, 10 Jun 2022 08:48:14 +0000 (UTC) Received: from pps.filterd (m0167089.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25A7WKNX005267; Fri, 10 Jun 2022 04:47:50 -0400 Received: from nwd2mta4.analog.com ([137.71.173.58]) by mx0a-00128a01.pphosted.com (PPS) with ESMTPS id 3ghq33kq7t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 10 Jun 2022 04:47:50 -0400 Received: from ASHBMBX8.ad.analog.com (ASHBMBX8.ad.analog.com [10.64.17.5]) by nwd2mta4.analog.com (8.14.7/8.14.7) with ESMTP id 25A8lnqA027535 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 10 Jun 2022 04:47:49 -0400 Received: from ASHBMBX9.ad.analog.com (10.64.17.10) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Fri, 10 Jun 2022 04:47:48 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Fri, 10 Jun 2022 04:47:48 -0400 Received: from nsa.ad.analog.com ([10.44.3.70]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 25A8imig014275; Fri, 10 Jun 2022 04:47:36 -0400 From: =?utf-8?q?Nuno_S=C3=A1?= To: , , , , , Lad Prabhakar , , , , , CC: Cai Huoqing , Benjamin Fair , Jishnu Prakash , Linus Walleij , Lars-Peter Clausen , Alexandre Torgue , Amit Kucheria , Andy Gross , Michael Hennerich , Haibo Chen , Benson Leung , "Rafael J. Wysocki" , Alexandre Belloni , Christophe Branchereau , Patrick Venture , Arnd Bergmann , Nancy Yuen , Sascha Hauer , Daniel Lezcano , Gwendal Grignou , Saravanan Sekar , Tali Perry , Maxime Coquelin , Paul Cercueil , Thara Gopinath , Avi Fishman , Lorenzo Bianconi , Claudiu Beznea , Pengutronix Kernel Team , Andy Shevchenko , Fabrice Gasnier , Matthias Brugger , Tomer Maimon , Bjorn Andersson , Nicolas Ferre , Jonathan Cameron , Zhang Rui , Shawn Guo , Guenter Roeck , Fabio Estevam , Olivier Moysan , Eugen Hristev , Miquel Raynal Subject: [PATCH 20/34] iio: inkern: only relase the device node when done with it Date: Fri, 10 Jun 2022 10:45:31 +0200 Message-ID: <20220610084545.547700-21-nuno.sa@analog.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220610084545.547700-1-nuno.sa@analog.com> References: <20220610084545.547700-1-nuno.sa@analog.com> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-ORIG-GUID: SkfWEkHBuamWrqTrmnu36au12Kn0EwdD X-Proofpoint-GUID: SkfWEkHBuamWrqTrmnu36au12Kn0EwdD X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-10_02,2022-06-09_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 mlxlogscore=924 phishscore=0 priorityscore=1501 adultscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 spamscore=0 impostorscore=0 bulkscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206100031 'of_node_put()' can potentially release the memory pointed to by 'iiospec.np' which would leave us with an invalid pointer (and we would still pass it in 'of_xlate()'). As such, we can only release the node after we are done with it. Fixes: 17d82b47a215d ("iio: Add OF support") Signed-off-by: Nuno Sá --- drivers/iio/inkern.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index df74765d33dc..9d87057794fc 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -165,9 +165,10 @@ static int __of_iio_channel_get(struct iio_channel *channel, idev = bus_find_device(&iio_bus_type, NULL, iiospec.np, iio_dev_node_match); - of_node_put(iiospec.np); - if (idev == NULL) + if (idev == NULL) { + of_node_put(iiospec.np); return -EPROBE_DEFER; + } indio_dev = dev_to_iio_dev(idev); channel->indio_dev = indio_dev; @@ -175,6 +176,7 @@ static int __of_iio_channel_get(struct iio_channel *channel, index = indio_dev->info->of_xlate(indio_dev, &iiospec); else index = __of_iio_simple_xlate(indio_dev, &iiospec); + of_node_put(iiospec.np); if (index < 0) goto err_put; channel->channel = &indio_dev->channels[index];