[PATCH v1] drm/nouveau/clk: avoid potential null-dereference

[Andy Shevchenko]

We have to check pointer before usage.

Reported-by: Andrey Karpov <karpov at viva64.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko at gmail.com>
---
 drivers/gpu/drm/nouveau/core/subdev/clock/base.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c 
b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c
index e51b72d..2e84436 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/clock/base.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/clock/base.c
@@ -322,7 +322,6 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx)
                return 0;

        pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
-       cstate = &pstate->base;
        if (!pstate)
                return -ENOMEM;

@@ -330,6 +329,9 @@ nouveau_pstate_new(struct nouveau_clock *clk, int idx)

        pstate->pstate = perfE.pstate;
        pstate->fanspeed = perfE.fanspeed;
+
+       cstate = &pstate->base;
+
        cstate->voltage = perfE.voltage;
        cstate->domain[nv_clk_src_core] = perfE.core;
        cstate->domain[nv_clk_src_shader] = perfE.shader;
-- 
1.8.3.101.g727a46b