gpu: nvgpu: fix Coverity issue of dereferencing NULL return value

Coverity id : 20300

Bug 1416640

Change-Id: I43fe2aecd3f1e10d00518c3f9bd19726c17ba778
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1028798
Reviewed-by: Puneet Saxena <puneets@nvidia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c b/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
index 9ed5fef3..11790f4a 100644
--- a/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
@@ -272,6 +272,8 @@ static int nvgpu_gpu_ioctl_inval_icache(
         struct nvgpu_dbg_gpu_reg_op ops;
 
         ch = gk20a_get_channel_from_file(args->channel_fd);
+        if (!ch)
+                return -EINVAL;
 
         ops.op     = REGOP(READ_32);
         ops.type   = REGOP(TYPE_GR_CTX);