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[ Upstream commit 90de546d9a0b3c771667af18bb3f80567eabb89b ] In vnet_port_probe() and vsw_port_probe(), we should check the return value of mdesc_grab() as it may return NULL which can caused NPD bugs. Fixes:5d01fa0c6b("ldmvsw: Add ldmvsw.c driver code") Fixes:43fdf27470("[SPARC64]: Abstract out mdesc accesses for better MD update handling.") Signed-off-by: Liang He <windhl@126.com> Reviewed-by: Piotr Raczynski <piotr.raczynski@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>