[PATCH 4.19 209/280] gpio: pca953x: Fix dereference of irq data in shutdown

From: Greg Kroah-Hartman
Date: Fri Mar 22 2019 - 08:07:27 EST


4.19-stable review patch. If anyone has any objections, please let me know.

------------------

From: Mark Walton <mark.walton@xxxxxxxxxxxxx>

commit c378b3aa015931a46c91d6ccc2fe04d97801d060 upstream.

If a PCA953x gpio was used as an interrupt and then released,
the shutdown function was trying to extract the pca953x_chip
pointer directly from the irq_data, but in reality was getting
the gpio_chip structure.

The net effect was that the subsequent writes to the data
structure corrupted data in the gpio_chip structure, which wasn't
immediately obvious until attempting to use the GPIO again in the
future, at which point the kernel panics.

This fix correctly extracts the pca953x_chip structure via the
gpio_chip structure, as is correctly done in the other irq
functions.

Fixes: 0a70fe00efea ("gpio: pca953x: Clear irq trigger type on irq shutdown")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Mark Walton <mark.walton@xxxxxxxxxxxxx>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/gpio/gpio-pca953x.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -543,7 +543,8 @@ static int pca953x_irq_set_type(struct i

static void pca953x_irq_shutdown(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = gpiochip_get_data(gc);
u8 mask = 1 << (d->hwirq % BANK_SZ);

chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;