[PATCH 5.5 080/367] MIPS: SGI-IP30: Check for valid pointer before using it

[Greg Kroah-Hartman]

From: Thomas Bogendoerfer <tbogendoerfer@xxxxxxx>

commit c0e79fd89749b0cda1c72049e2772dd2eeada86f upstream.

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: 7505576d1c1a ("MIPS: add support for SGI Octane (IP30)")
Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@xxxxxxx>
Signed-off-by: Paul Burton <paulburton@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v5.5+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/mips/sgi-ip30/ip30-irq.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/mips/sgi-ip30/ip30-irq.c
+++ b/arch/mips/sgi-ip30/ip30-irq.c
@@ -232,9 +232,10 @@ static void heart_domain_free(struct irq
 		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 = {