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>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index f09b2cba40ca505649decf23a27b60850b62407a..7cd567b268fda4686e3e52e732cbe8eee9fc84b9 100644 (file)
--- 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);