linux-kernel - [PATCH] mfd: stmfx: Fix an endian bug in stmfx_irq

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Date:   Mon, 17 Jun 2019 22:06:05 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Lee Jones <lee.jones@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Amelie Delaunay <amelie.delaunay@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] mfd: stmfx: Fix an endian bug in stmfx_irq_handler()

It's not okay to cast a "u32 *" to "unsigned long *" when you are
doing a for_each_set_bit() loop because that will break on big
endian systems.

Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
Fixes: 386145601b82 ("mfd: stmfx: Uninitialized variable in stmfx_irq_handler()")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 drivers/mfd/stmfx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/stmfx.c b/drivers/mfd/stmfx.c
index 7c419c078688..857991cb3cbb 100644
--- a/drivers/mfd/stmfx.c
+++ b/drivers/mfd/stmfx.c
@@ -204,6 +204,7 @@ static struct irq_chip stmfx_irq_chip = {
 static irqreturn_t stmfx_irq_handler(int irq, void *data)
 {
 	struct stmfx *stmfx = data;
+	unsigned long bits;
 	u32 pending, ack;
 	int n, ret;
 
@@ -222,7 +223,8 @@ static irqreturn_t stmfx_irq_handler(int irq, void *data)
 			return IRQ_NONE;
 	}
 
-	for_each_set_bit(n, (unsigned long *)&pending, STMFX_REG_IRQ_SRC_MAX)
+	bits = pending;
+	for_each_set_bit(n, &bits, STMFX_REG_IRQ_SRC_MAX)
 		handle_nested_irq(irq_find_mapping(stmfx->irq_domain, n));
 
 	return IRQ_HANDLED;
-- 
2.20.1