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SubjectRe: [PATCH] MIPS: SGI-IP27: Fix use of unchecked pointer in shutdown_bridge_irq
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On 3/28/2019 7:07 PM, Thomas Bogendoerfer wrote:
> 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@oracle.com>
> Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>


Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

-Mukesh

> ---
> 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);
> }
>

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