[PATCH rdma-next] IB/mthca: Check validity of output parameter pointer

[Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

The mthca driver didn't check supplied pointer to functions
mthca_cmd_poll() and mthca_cmd_wait(). This caused to the following
smatch errors:

drivers/infiniband/hw/mthca/mthca_cmd.c:371 mthca_cmd_poll() error: we previously assumed 'out_param' could be null (see line 353)
drivers/infiniband/hw/mthca/mthca_cmd.c:454 mthca_cmd_wait() error: we previously assumed 'out_param' could be null (see line 432)

In reality all callers of these functions are setting out_is_imm
flag are providing pointer too. However it is better to check
again to remove smatch errors to achieve warning free subsystem.

Signed-off-by: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 Based on k.o/for-4.12 branch.
---
 drivers/infiniband/hw/mthca/mthca_cmd.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.c b/drivers/infiniband/hw/mthca/mthca_cmd.c
index c7f49bbb0c72..9d83a53c0c67 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.c
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
@@ -367,12 +367,16 @@ static int mthca_cmd_poll(struct mthca_dev *dev,
 		goto out;
 	}

-	if (out_is_imm)
+	if (out_is_imm && out_param) {
 		*out_param =
 			(u64) be32_to_cpu((__force __be32)
 					  __raw_readl(dev->hcr + HCR_OUT_PARAM_OFFSET)) << 32 |
 			(u64) be32_to_cpu((__force __be32)
 					  __raw_readl(dev->hcr + HCR_OUT_PARAM_OFFSET + 4));
+	} else if (out_is_imm) {
+		err = -EINVAL;
+		goto out;
+	}

 	status = be32_to_cpu((__force __be32) __raw_readl(dev->hcr + HCR_STATUS_OFFSET)) >> 24;
 	if (status) {
@@ -450,8 +454,12 @@ static int mthca_cmd_wait(struct mthca_dev *dev,
 		err = mthca_status_to_errno(context->status);
 	}

-	if (out_is_imm)
+	if (out_is_imm && out_param) {
 		*out_param = context->out_param;
+	} else if (out_is_imm) {
+		err = -EINVAL;
+		goto out;
+	}

 out:
 	spin_lock(&dev->cmd.context_lock);
--
2.12.2

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