gpu: nvgpu: Submit coverity fixes

Clear ioctl buffer and fix double free, and error case memory leak.

Bug 200059216

Change-Id: I21cc2b0f6a7e8fca09f72caf4c54d570b13f400b
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/655347

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c b/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
index 34351f93..4e85abc8 100644
--- a/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
@@ -268,6 +268,7 @@ long gk20a_ctrl_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg
 
         BUG_ON(_IOC_SIZE(cmd) > NVGPU_GPU_IOCTL_MAX_ARG_SIZE);
 
+        memset(buf, 0, sizeof(buf));
         if (_IOC_DIR(cmd) & _IOC_WRITE) {
                 if (copy_from_user(buf, (void __user *)arg, _IOC_SIZE(cmd)))
                         return -EFAULT;