MIPS: OCTEON: irq: Check for null return on kzalloc allocation

The allocation of host_data is not null checked, leading to a null
pointer dereference if the allocation fails. Fix this by adding a null
check and return with -ENOMEM.

Fixes: 64b139f97c01 ("MIPS: OCTEON: irq: add CIB and other fixes")
Signed-off-by: Colin Ian King <[email protected]>
Acked-by: David Daney <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: "Steven J. Hill" <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # 4.0+
Patchwork: https://patchwork.linux-mips.org/patch/18658/
Signed-off-by: James Hogan <[email protected]>

diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index 5b3a3f6a9ad31fd845bd18cdd3197d9c75833c84..d99f5242169e7acb31f8cfa71cd6e14d24e94c82 100644 (file)
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -2277,6 +2277,8 @@ static int __init octeon_irq_init_cib(struct device_node *ciu_node,
        }
 
        host_data = kzalloc(sizeof(*host_data), GFP_KERNEL);
+       if (!host_data)
+               return -ENOMEM;
        raw_spin_lock_init(&host_data->lock);
 
        addr = of_get_address(ciu_node, 0, NULL, NULL);