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If buf[-1] just happens to hold the byte 0x0A, then nread can wrap around to (size_t)-1, leading to invalid memory accesses. This has caused segmentation faults when trying to build the latest kernel snapshots for i686 in Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1592374 Signed-off-by: Jerry James <[email protected]> [[email protected]: reformatted patch for submission] Signed-off-by: Alexander Ploumistos <[email protected]> Signed-off-by: Masahiro Yamada <[email protected]>