gpio / ACPI: Don't crash on NULL chip->dev
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>
Tested-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index bf0f8b4..d5be56f 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -233,7 +233,7 @@
{
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 @@
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 @@
acpi_handle handle;
acpi_status status;
+ if (!chip || !chip->dev)
+ return;
+
handle = ACPI_HANDLE(chip->dev);
if (!handle)
return;
@@ -531,6 +534,9 @@
acpi_handle handle;
acpi_status status;
+ if (!chip || !chip->dev)
+ return;
+
handle = ACPI_HANDLE(chip->dev);
if (!handle)
return;