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Add a validity check for the base value passed to nvgpu_balloc_fixed_buddy_locked(). Without this check, overflow arithmetic can occur when balloc_base_shift() is called. JIRA NVGPU-3563 Change-Id: I0194486d4c6d68dc338b8ad59f031007380b49d0 Signed-off-by: Philip Elcan <pelcan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/2128586 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Alex Waterman <alexw@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>