diff options
Diffstat (limited to 'gpio-ACPI-Dont-crash-on-NULL-chip-dev.patch')
| -rw-r--r-- | gpio-ACPI-Dont-crash-on-NULL-chip-dev.patch | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/gpio-ACPI-Dont-crash-on-NULL-chip-dev.patch b/gpio-ACPI-Dont-crash-on-NULL-chip-dev.patch deleted file mode 100644 index 56cd7535a..000000000 --- a/gpio-ACPI-Dont-crash-on-NULL-chip-dev.patch +++ /dev/null @@ -1,163 +0,0 @@ -Path: news.gmane.org!not-for-mail -From: Mika Westerberg <mika.westerberg@linux.intel.com> -Newsgroups: gmane.linux.kernel.gpio,gmane.linux.kernel -Subject: [PATCH] gpio / ACPI: Don't crash on NULL chip->dev -Date: Mon, 31 Mar 2014 15:16:49 +0300 -Lines: 114 -Approved: news@gmane.org -Message-ID: <1396268209-19108-1-git-send-email-mika.westerberg@linux.intel.com> -NNTP-Posting-Host: plane.gmane.org -X-Trace: ger.gmane.org 1396268225 9280 80.91.229.3 (31 Mar 2014 12:17:05 GMT) -X-Complaints-To: usenet@ger.gmane.org -NNTP-Posting-Date: Mon, 31 Mar 2014 12:17:05 +0000 (UTC) -Cc: Alexandre Courbot <gnurou@gmail.com>, - Sabrina Dubroca <sd@queasysnail.net>, - linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, - Mika Westerberg <mika.westerberg@linux.intel.com> -To: Linus Walleij <linus.walleij@linaro.org> -Original-X-From: linux-gpio-owner@vger.kernel.org Mon Mar 31 14:16:58 2014 -Return-path: <linux-gpio-owner@vger.kernel.org> -Envelope-to: glg-linux-gpio@plane.gmane.org -Original-Received: from vger.kernel.org ([209.132.180.67]) - by plane.gmane.org with esmtp (Exim 4.69) - (envelope-from <linux-gpio-owner@vger.kernel.org>) - id 1WUb96-00049j-5K - for glg-linux-gpio@plane.gmane.org; Mon, 31 Mar 2014 14:16:56 +0200 -Original-Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand - id S1752154AbaCaMQz (ORCPT <rfc822;glg-linux-gpio@m.gmane.org>); - Mon, 31 Mar 2014 08:16:55 -0400 -Original-Received: from mga11.intel.com ([192.55.52.93]:46420 "EHLO mga11.intel.com" - rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP - id S1751749AbaCaMQy (ORCPT <rfc822;linux-gpio@vger.kernel.org>); - Mon, 31 Mar 2014 08:16:54 -0400 -Original-Received: from fmsmga002.fm.intel.com ([10.253.24.26]) - by fmsmga102.fm.intel.com with ESMTP; 31 Mar 2014 05:16:54 -0700 -X-ExtLoop1: 1 -X-IronPort-AV: E=Sophos;i="4.97,764,1389772800"; - d="scan'208";a="510938110" -Original-Received: from blue.fi.intel.com ([10.237.72.156]) - by fmsmga002.fm.intel.com with ESMTP; 31 Mar 2014 05:16:50 -0700 -Original-Received: by blue.fi.intel.com (Postfix, from userid 1004) - id 73976E0098; Mon, 31 Mar 2014 15:16:49 +0300 (EEST) -X-Mailer: git-send-email 1.9.1 -Original-Sender: linux-gpio-owner@vger.kernel.org -Precedence: bulk -List-ID: <linux-gpio.vger.kernel.org> -X-Mailing-List: linux-gpio@vger.kernel.org -Xref: news.gmane.org gmane.linux.kernel.gpio:2461 gmane.linux.kernel:1675129 -Archived-At: <http://permalink.gmane.org/gmane.linux.kernel.gpio/2461> - -Commit aa92b6f689ac (gpio / ACPI: Allocate ACPI specific data directly in -acpi_gpiochip_add()) moved ACPI handle checking to acpi_gpiochip_add() but -forgot to check whether chip->dev is NULL before dereferencing it. - -Since chip->dev pointer is optional we can end up with crash like following: - - BUG: unable to handle kernel NULL pointer dereference at 00000138 - IP: [<c126c2b3>] acpi_gpiochip_add+0x13/0x190 - *pde = 00000000 - Oops: 0000 [#1] PREEMPT SMP - Modules linked in: ssb(+) ... - CPU: 0 PID: 512 Comm: modprobe Tainted: G W 3.14.0-rc7-next-20140324-t1 #24 - Hardware name: Dell Inc. Latitude D830 /0UY141, BIOS A02 06/07/2007 - task: f5799900 ti: f543e000 task.ti: f543e000 - EIP: 0060:[<c126c2b3>] EFLAGS: 00010282 CPU: 0 - EIP is at acpi_gpiochip_add+0x13/0x190 - EAX: 00000000 EBX: f57824c4 ECX: 00000000 EDX: 00000000 - ESI: f57824c4 EDI: 00000010 EBP: f543fc54 ESP: f543fc40 - DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 - CR0: 8005003b CR2: 00000138 CR3: 355f8000 CR4: 000007d0 - Stack: - f543fc5c fd1f7790 f57824c4 000000be 00000010 f543fc84 c1269f4e f543fc74 - fd1f78bd 00008002 f57822b0 f5782090 fd1f8400 00000286 fd1f9994 00000000 - f5782000 f543fc8c fd1f7e39 f543fcc8 fd1f0bd8 000000c0 00000000 00000000 - Call Trace: - [<fd1f7790>] ? ssb_pcie_mdio_write+0xa0/0xd0 [ssb] - [<c1269f4e>] gpiochip_add+0xee/0x300 - [<fd1f78bd>] ? ssb_pcicore_serdes_workaround+0xfd/0x140 [ssb] - [<fd1f7e39>] ssb_gpio_init+0x89/0xa0 [ssb] - [<fd1f0bd8>] ssb_attach_queued_buses+0xc8/0x2d0 [ssb] - [<fd1f0f65>] ssb_bus_register+0x185/0x1f0 [ssb] - [<fd1f3120>] ? ssb_pci_xtal+0x220/0x220 [ssb] - [<fd1f106c>] ssb_bus_pcibus_register+0x2c/0x80 [ssb] - [<fd1f40dc>] ssb_pcihost_probe+0x9c/0x110 [ssb] - [<c1276c8f>] pci_device_probe+0x6f/0xc0 - [<c11bdb55>] ? sysfs_create_link+0x25/0x40 - [<c131d8b9>] driver_probe_device+0x79/0x360 - [<c1276512>] ? pci_match_device+0xb2/0xc0 - [<c131dc51>] __driver_attach+0x71/0x80 - [<c131dbe0>] ? __device_attach+0x40/0x40 - [<c131bd87>] bus_for_each_dev+0x47/0x80 - [<c131d3ae>] driver_attach+0x1e/0x20 - [<c131dbe0>] ? __device_attach+0x40/0x40 - [<c131d007>] bus_add_driver+0x157/0x230 - [<c131e219>] driver_register+0x59/0xe0 - ... - -Fix this by checking chip->dev pointer against NULL first. Also we can now -remove redundant check in acpi_gpiochip_request/free_interrupts(). - -Reported-by: Sabrina Dubroca <sd@queasysnail.net> -Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> ---- -Sabrina, - -Can you please re-test this and provide your tested-by? I changed the patch -a bit to remove redundant checks. Just to be sure that I don't accidentally -break something. - -Thanks. - - drivers/gpio/gpiolib-acpi.c | 10 ++++++++-- - 1 file changed, 8 insertions(+), 2 deletions(-) - -diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c -index bf0f8b476696..d5be56fe689e 100644 ---- a/drivers/gpio/gpiolib-acpi.c -+++ b/drivers/gpio/gpiolib-acpi.c -@@ -233,7 +233,7 @@ static void acpi_gpiochip_request_interrupts(struct acpi_gpio_chip *acpi_gpio) - { - struct gpio_chip *chip = acpi_gpio->chip; - -- if (!chip->dev || !chip->to_irq) -+ if (!chip->to_irq) - return; - - INIT_LIST_HEAD(&acpi_gpio->events); -@@ -253,7 +253,7 @@ static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio) - struct acpi_gpio_event *event, *ep; - struct gpio_chip *chip = acpi_gpio->chip; - -- if (!chip->dev || !chip->to_irq) -+ if (!chip->to_irq) - return; - - list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) { -@@ -501,6 +501,9 @@ void acpi_gpiochip_add(struct gpio_chip *chip) - acpi_handle handle; - acpi_status status; - -+ if (!chip || !chip->dev) -+ return; -+ - handle = ACPI_HANDLE(chip->dev); - if (!handle) - return; -@@ -531,6 +534,9 @@ void acpi_gpiochip_remove(struct gpio_chip *chip) - acpi_handle handle; - acpi_status status; - -+ if (!chip || !chip->dev) -+ return; -+ - handle = ACPI_HANDLE(chip->dev); - if (!handle) - return; --- -1.9.1 - --- -To unsubscribe from this list: send the line "unsubscribe linux-gpio" in -the body of a message to majordomo@vger.kernel.org -More majordomo info at http://vger.kernel.org/majordomo-info.html - |