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[ Upstream commit458f5d92df] When the page_ring is not used page_ptr_mask is 0. Do not dereference page_ring[0] in this case. Fixes:2768935a46("sfc: reuse pages to avoid DMA mapping/unmapping costs") Reported-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>