[PATCH 5.14 030/432] pinctrl: stmfx: Fix hazardous u8[] to unsigned long cast

[Greg Kroah-Hartman]

From: Marc Zyngier <maz@xxxxxxxxxx>

commit 1b73e588f47397dee6e4bdfd953e0306c60b5fe5 upstream.

Casting a small array of u8 to an unsigned long is *never* OK:

- it does funny thing when the array size is less than that of a long,
  as it accesses random places in the stack
- it makes everything even more fun with a BE kernel

Fix this by building the unsigned long used as a bitmap byte by byte,
in a way that works across endianess and has no undefined behaviours.

An extra BUILD_BUG_ON() catches the unlikely case where the array
would be larger than a single unsigned long.

Fixes: 1490d9f841b1 ("pinctrl: Add STMFX GPIO expander Pinctrl/GPIO driver")
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Amelie Delaunay <amelie.delaunay@xxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Maxime Coquelin <mcoquelin.stm32@xxxxxxxxx>
Cc: Alexandre Torgue <alexandre.torgue@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210725180830.250218-1-maz@xxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-stmfx.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/pinctrl/pinctrl-stmfx.c
+++ b/drivers/pinctrl/pinctrl-stmfx.c
@@ -566,7 +566,7 @@ static irqreturn_t stmfx_pinctrl_irq_thr
 	u8 pending[NR_GPIO_REGS];
 	u8 src[NR_GPIO_REGS] = {0, 0, 0};
 	unsigned long n, status;
-	int ret;
+	int i, ret;
 
 	ret = regmap_bulk_read(pctl->stmfx->map, STMFX_REG_IRQ_GPI_PENDING,
 			       &pending, NR_GPIO_REGS);
@@ -576,7 +576,9 @@ static irqreturn_t stmfx_pinctrl_irq_thr
 	regmap_bulk_write(pctl->stmfx->map, STMFX_REG_IRQ_GPI_SRC,
 			  src, NR_GPIO_REGS);
 
-	status = *(unsigned long *)pending;
+	BUILD_BUG_ON(NR_GPIO_REGS > sizeof(status));
+	for (i = 0, status = 0; i < NR_GPIO_REGS; i++)
+		status |= (unsigned long)pending[i] << (i * 8);
 	for_each_set_bit(n, &status, gc->ngpio) {
 		handle_nested_irq(irq_find_mapping(gc->irq.domain, n));
 		stmfx_pinctrl_irq_toggle_trigger(pctl, n);