From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: kernel-team@android.com, stable@vger.kernel.org,
Amelie Delaunay <amelie.delaunay@foss.st.com>,
Linus Walleij <linus.walleij@linaro.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>
Subject: [PATCH] pinctrl: stmfx: Fix hazardous u8[] to unsigned long cast
Date: Sun, 25 Jul 2021 19:08:30 +0100 [thread overview]
Message-ID: <20210725180830.250218-1-maz@kernel.org> (raw)
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@kernel.org>
Cc: stable@vger.kernel.org
Cc: Amelie Delaunay <amelie.delaunay@foss.st.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
---
drivers/pinctrl/pinctrl-stmfx.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-stmfx.c b/drivers/pinctrl/pinctrl-stmfx.c
index 008c83107a3c..5fa2488fae87 100644
--- a/drivers/pinctrl/pinctrl-stmfx.c
+++ b/drivers/pinctrl/pinctrl-stmfx.c
@@ -566,7 +566,7 @@ static irqreturn_t stmfx_pinctrl_irq_thread_fn(int irq, void *dev_id)
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_thread_fn(int irq, void *dev_id)
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);
--
2.30.2
next reply other threads:[~2021-07-25 18:08 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-25 18:08 Marc Zyngier [this message]
2021-08-10 12:48 ` [PATCH] pinctrl: stmfx: Fix hazardous u8[] to unsigned long cast Linus Walleij
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