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[Bug string/21014] i686 memchr overflows internal pointer check

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- Log -----------------------------------------------------------------;h=23d27709a423aec32821e9a5198a10267107bae2

commit 23d27709a423aec32821e9a5198a10267107bae2
Author: Adhemerval Zanella <>
Date:   Mon Jan 2 12:20:21 2017 -0200

    Fix i686 memchr for large input sizes

    Similar to BZ#19387 and BZ#20971, both i686 memchr optimized assembly
    implementations (memchr-sse2-bsf and memchr-sse2) do not handle the
    size overflow correctly.

    It is shown by the new tests added by commit 3daef2c8ee4df29, where
    both implementation fails with size as SIZE_MAX.

    This patch uses a similar strategy used on 3daef2c8ee4df2, where
    saturared math is used for overflow case.

    Checked on i686-linux-gnu.

        [BZ #21014]
        * sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S (MEMCHR): Avoid
        in pointer addition.
        * sysdeps/i386/i686/multiarch/memchr-sse2.S (MEMCHR): Likewise.


Summary of changes:
 ChangeLog                                     |    7 +++++++
 sysdeps/i386/i686/multiarch/memchr-sse2-bsf.S |   10 ++++++++--
 sysdeps/i386/i686/multiarch/memchr-sse2.S     |    8 +++++++-
 3 files changed, 22 insertions(+), 3 deletions(-)

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