gpu: nvgpu: check null before accessing nvgpu_firmware.

check for null value of nvgpu_firmware before accessing them in
nvgpu_firmware_release().

Coverity defect id: 2983427, 2983428 
Bug 200291879

Change-Id: I946cb448351441ee820aa3e5d8db649943d20d16
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1683505
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/firmware.c b/drivers/gpu/nvgpu/common/linux/firmware.c
index a76165ff..9a4dc653 100644
--- a/drivers/gpu/nvgpu/common/linux/firmware.c
+++ b/drivers/gpu/nvgpu/common/linux/firmware.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -109,6 +109,9 @@ err:
 
 void nvgpu_release_firmware(struct gk20a *g, struct nvgpu_firmware *fw)
 {
+        if(!fw)
+                return;
+
         nvgpu_kfree(g, fw->data);
         nvgpu_kfree(g, fw);
 }