linux-kernel - [PATCH] MIPS: SGI-IP27: Fix use of unchecked pointer in shutdown_bridge

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Date:   Thu, 28 Mar 2019 14:37:45 +0100
From:   Thomas Bogendoerfer <tbogendoerfer@...e.de>
To:     Ralf Baechle <ralf@...ux-mips.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] MIPS: SGI-IP27: Fix use of unchecked pointer in shutdown_bridge_irq

smatch complaint:

    arch/mips/sgi-ip27/ip27-irq.c:123 shutdown_bridge_irq()
    warn: variable dereferenced before check 'hd' (see line 121)

Fix it by removing local variable and use hd->pin directly.

Fixes: 69a07a41d908 ("MIPS: SGI-IP27: rework HUB interrupts")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@...e.de>
---
 arch/mips/sgi-ip27/ip27-irq.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/mips/sgi-ip27/ip27-irq.c b/arch/mips/sgi-ip27/ip27-irq.c
index 710a59764b01..a32f843cdbe0 100644
--- a/arch/mips/sgi-ip27/ip27-irq.c
+++ b/arch/mips/sgi-ip27/ip27-irq.c
@@ -118,7 +118,6 @@ static void shutdown_bridge_irq(struct irq_data *d)
 {
 	struct hub_irq_data *hd = irq_data_get_irq_chip_data(d);
 	struct bridge_controller *bc;
-	int pin = hd->pin;
 
 	if (!hd)
 		return;
@@ -126,7 +125,7 @@ static void shutdown_bridge_irq(struct irq_data *d)
 	disable_hub_irq(d);
 
 	bc = hd->bc;
-	bridge_clr(bc, b_int_enable, (1 << pin));
+	bridge_clr(bc, b_int_enable, (1 << hd->pin));
 	bridge_read(bc, b_wid_tflush);
 }
 
-- 
2.13.7