From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 AC2809446 for ; Sun, 13 Aug 2023 21:35:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35946C433C7; Sun, 13 Aug 2023 21:35:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691962554; bh=yUya7SHZVwqHyyyGpYE5TQMlJMTqyALV1ebT2yw27mE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=n1PL3V3r6J0ziZL3L5iqRBssYPxXjPh/WNCWRBQdfHtVg1QMeIT06Z5cA9EZO2L76 tg5KVxwqzn5+Me6tEqd327BwfkMeG9U2Y32ISt3Szh7uIsruJwcivxkE9ffXp15CwO a/H0QkrEdzUZez/NIxzyHMR15opUdpzzZf1PEVQc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Andy Shevchenko , Milan Zamazal , Jonathan Cameron Subject: [PATCH 6.1 072/149] iio: core: Prevent invalid memory access when there is no parent Date: Sun, 13 Aug 2023 23:18:37 +0200 Message-ID: <20230813211720.948917729@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230813211718.757428827@linuxfoundation.org> References: <20230813211718.757428827@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Milan Zamazal commit b2a69969908fcaf68596dfc04369af0fe2e1d2f7 upstream. Commit 813665564b3d ("iio: core: Convert to use firmware node handle instead of OF node") switched the kind of nodes to use for label retrieval in device registration. Probably an unwanted change in that commit was that if the device has no parent then NULL pointer is accessed. This is what happens in the stock IIO dummy driver when a new entry is created in configfs: # mkdir /sys/kernel/config/iio/devices/dummy/foo BUG: kernel NULL pointer dereference, address: ... ... Call Trace: __iio_device_register iio_dummy_probe Since there seems to be no reason to make a parent device of an IIO dummy device mandatory, let’s prevent the invalid memory access in __iio_device_register when the parent device is NULL. With this change, the IIO dummy driver works fine with configfs. Fixes: 813665564b3d ("iio: core: Convert to use firmware node handle instead of OF node") Reviewed-by: Andy Shevchenko Signed-off-by: Milan Zamazal Link: https://lore.kernel.org/r/20230719083208.88149-1-mzamazal@redhat.com Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/industrialio-core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -1916,7 +1916,7 @@ static const struct iio_buffer_setup_ops int __iio_device_register(struct iio_dev *indio_dev, struct module *this_mod) { struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev); - struct fwnode_handle *fwnode; + struct fwnode_handle *fwnode = NULL; int ret; if (!indio_dev->info) @@ -1927,7 +1927,8 @@ int __iio_device_register(struct iio_dev /* If the calling driver did not initialize firmware node, do it here */ if (dev_fwnode(&indio_dev->dev)) fwnode = dev_fwnode(&indio_dev->dev); - else + /* The default dummy IIO device has no parent */ + else if (indio_dev->dev.parent) fwnode = dev_fwnode(indio_dev->dev.parent); device_set_node(&indio_dev->dev, fwnode);