drm/amdgpu: fix crash on invalid CS IOCTL

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index f09b2cba40ca..7cd567b268fd 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -445,8 +445,9 @@ static void amdgpu_cs_parser_fini(struct amdgpu_cs_parser *parser, int error, bo
         for (i = 0; i < parser->nchunks; i++)
                 drm_free_large(parser->chunks[i].kdata);
         kfree(parser->chunks);
-        for (i = 0; i < parser->num_ibs; i++)
-                amdgpu_ib_free(parser->adev, &parser->ibs[i]);
+        if (parser->ibs)
+                for (i = 0; i < parser->num_ibs; i++)
+                        amdgpu_ib_free(parser->adev, &parser->ibs[i]);
         kfree(parser->ibs);
         if (parser->uf.bo)
                 drm_gem_object_unreference_unlocked(&parser->uf.bo->gem_base);