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/vgpu/gr_vgpu.c b/drivers/gpu/nvgpu/vgpu/gr_vgpu.c
index 46b48b33..b1a8027e 100644
--- a/drivers/gpu/nvgpu/vgpu/gr_vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/gr_vgpu.c
@@ -273,6 +273,7 @@ static int vgpu_gr_alloc_channel_gr_ctx(struct gk20a *g,
         err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
 
         if (err || msg.ret) {
+                kfree(gr_ctx);
                 gk20a_vm_free_va(ch_vm, gr_ctx->gpu_va, gr_ctx->size, 0);
                 err = -ENOMEM;
         } else