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 EFB811C31 for ; Wed, 23 Nov 2022 09:50:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32977C433D6; Wed, 23 Nov 2022 09:50:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669197002; bh=sezWZ4QYSxPdkxAxY15z4Bqw8sXcw2zQ3DKWwec9j2c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kpXJxXRKpEyY3HhW5mSVadb6JNT8/6yKXhHKi+DbsA0wcQ+R/t+ZOLu5vMjL8BHp7 sWxsVaNPF6bb/UZWbUfm6EiNfwnMuKHxa/rQtojByV11KkveF8OR06+OpWme/27wU4 6ftRngybfkd+sHZE8A4Bj8Gw65KlLTgRQmn0yCl4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Yingliang , Damien Le Moal , Sasha Levin Subject: [PATCH 6.0 140/314] ata: libata-transport: fix error handling in ata_tdev_add() Date: Wed, 23 Nov 2022 09:49:45 +0100 Message-Id: <20221123084631.886139338@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123084625.457073469@linuxfoundation.org> References: <20221123084625.457073469@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: Yang Yingliang [ Upstream commit 1ff36351309e3eadcff297480baf4785e726de9b ] In ata_tdev_add(), the return value of transport_add_device() is not checked. As a result, it causes null-ptr-deref while removing the module, because transport_remove_device() is called to remove the device that was not added. Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0 CPU: 13 PID: 13603 Comm: rmmod Kdump: loaded Tainted: G W 6.1.0-rc3+ #36 pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : device_del+0x48/0x3a0 lr : device_del+0x44/0x3a0 Call trace: device_del+0x48/0x3a0 attribute_container_class_device_del+0x28/0x40 transport_remove_classdev+0x60/0x7c attribute_container_device_trigger+0x118/0x120 transport_remove_device+0x20/0x30 ata_tdev_delete+0x24/0x50 [libata] ata_tlink_delete+0x40/0xa0 [libata] ata_tport_delete+0x2c/0x60 [libata] ata_port_detach+0x148/0x1b0 [libata] ata_pci_remove_one+0x50/0x80 [libata] ahci_remove_one+0x4c/0x8c [ahci] Fix this by checking and handling return value of transport_add_device() in ata_tdev_add(). In the error path, device_del() is called to delete the device which was added earlier in this function, and ata_tdev_free() is called to free ata_dev. Fixes: d9027470b886 ("[libata] Add ATA transport class") Signed-off-by: Yang Yingliang Signed-off-by: Damien Le Moal Signed-off-by: Sasha Levin --- drivers/ata/libata-transport.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c index aac9336e8153..e4fb9d1b9b39 100644 --- a/drivers/ata/libata-transport.c +++ b/drivers/ata/libata-transport.c @@ -713,7 +713,13 @@ static int ata_tdev_add(struct ata_device *ata_dev) return error; } - transport_add_device(dev); + error = transport_add_device(dev); + if (error) { + device_del(dev); + ata_tdev_free(ata_dev); + return error; + } + transport_configure_device(dev); return 0; } -- 2.35.1