bound BMF block walk to buffer end#1643
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the BMF block walk in
xs_parseBMFandCFESetFontDataadvancesbytesby file-controlled block sizes (bytes += 4 + c_read32(bytes),bytes += size - 8) without bounding the cursor against the buffer end, so a crafted block size makes the nextc_read*read past the allocation (found with an asan build feeding a truncated font); this bounds every advance and field read againstend.