drivers: gk20a: Add gr.ops NULL-ptr check

This fix add NULL-ptr checks for some of the user-accessible
ioctl.

Bug 3240771
Bug 200696704

Change-Id: Ibe7f75b31b2521a530883253a93ba832f010dc80
Signed-off-by: Thomas Steinle <tsteinle@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2483635
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Peter Daifuku <pdaifuku@nvidia.com>
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>
GVS: Gerrit_Virtual_Submit

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index 7bcf5281..abb53e66 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -1,7 +1,7 @@
 /*
  * GK20A Graphics
  *
- * Copyright (c) 2011-2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2011-2021, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -8851,6 +8851,10 @@ int gr_gk20a_wait_for_pause(struct gk20a *g, struct nvgpu_warpstate *w_state)
         u32 gpc, tpc, sm, sm_id;
         u32 global_mask;
 
+        if (!g->ops.gr.get_sm_no_lock_down_hww_global_esr_mask ||
+            !g->ops.gr.lock_down_sm || !g->ops.gr.bpt_reg_info)
+                return -EINVAL;
+
         /* Wait for the SMs to reach full stop. This condition is:
          * 1) All SMs with valid warps must be in the trap handler (SM_IN_TRAP_MODE)
          * 2) All SMs in the trap handler must have equivalent VALID and PAUSED warp
@@ -8908,6 +8912,9 @@ int gr_gk20a_clear_sm_errors(struct gk20a *g)
         u32 global_esr;
         u32 sm_per_tpc = nvgpu_get_litter_value(g, GPU_LIT_NUM_SM_PER_TPC);
 
+        if (!g->ops.gr.get_sm_hww_global_esr || !g->ops.gr.clear_sm_hww)
+                return -EINVAL;
+
         for (gpc = 0; gpc < gr->gpc_count; gpc++) {
 
                 /* check if any tpc has an exception */