tegra-hv-vse: Check ptr against NULL,before access.

This fix coverity issue: 9625627

Bug 200741055

Change-Id: I33c686ae973a44fbd7ed86e4b5a36f18683568fd
Signed-off-by: Achal Verma <achalv@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2527699
GVS: Gerrit_Virtual_Submit
Reviewed-by: Dmitry Pervushin <dpervushin@nvidia.com>
Reviewed-by: Rahul Jain (SW-TEGRA) <rahuljain@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2575325
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Phoenix Jung <pjung@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/crypto/tegra-hv-vse.c b/drivers/crypto/tegra-hv-vse.c
index 82d720671..f42db682d 100644
--- a/drivers/crypto/tegra-hv-vse.c
+++ b/drivers/crypto/tegra-hv-vse.c
@@ -1912,7 +1912,7 @@ static void complete_call_back(void *data)
         struct ablkcipher_request *req;
         struct tegra_vse_priv_data *priv =
                 (struct tegra_vse_priv_data *)data;
-        int err = status_to_errno(priv->rx_status);
+        int err;
         int num_sgs;
         void *buf;
 
@@ -1921,6 +1921,8 @@ static void complete_call_back(void *data)
                 return;
         }
 
+        err = status_to_errno(priv->rx_status);
+
         dma_sync_single_for_cpu(priv->se_dev->dev, priv->buf_addr,
                 priv->gather_buf_sz, DMA_BIDIRECTIONAL);
         buf = priv->buf;