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MIPS: SGI-IP30: Check for valid pointer before using it 

Fix issue detected by Smatch:

    ./arch/mips/sgi-ip30/ip30-irq.c:236 heart_domain_free()
     warn: variable dereferenced before check 'irqd' (see line 235)

Fixes: 7505576d1c ("MIPS: add support for SGI Octane (IP30)")
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Signed-off-by: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: <stable@vger.kernel.org> # v5.5+
This commit is contained in:
Thomas Bogendoerfer 2020-01-22 14:13:34 +01:00 committed by Paul Burton
parent 4f29ad200f
commit c0e79fd897
No known key found for this signature in database
GPG Key ID: 3EA79FACB57500DD
1 changed files with 3 additions and 2 deletions
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5
arch/mips/sgi-ip30/ip30-irq.c
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@ -232,9 +232,10 @@ static void heart_domain_free(struct irq_domain *domain,
return;
irqd = irq_domain_get_irq_data(domain, virq);
clear_bit(irqd->hwirq, heart_irq_map);
if (irqd && irqd->chip_data)
if (irqd) {
clear_bit(irqd->hwirq, heart_irq_map);
kfree(irqd->chip_data);
}
}
static const struct irq_domain_ops heart_domain_ops = {