[Bug math/21309] signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c

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https://sourceware.org/bugzilla/show_bug.cgi?id=21309

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=648615e13f8d7b638cb911926b8bb70804217f15

commit 648615e13f8d7b638cb911926b8bb70804217f15
Author: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date:   Tue Dec 19 18:41:01 2017 +0000

    Avoid signed shift overflow in pow (bug 21309).

    As noted in bug 21309, dbl-64/e_pow.c contains signed int shifts that,
    although the shift count is in the range [0, 31], shift bits into and
    beyond the sign bit and so are undefined in ISO C.  Although this is
    defined in GNU C, this patch from the bug cleans up the code to avoid
    those shifts.

    Tested for x86_64.

        [BZ #21309]
        * sysdeps/ieee754/dbl-64/e_pow.c (checkint): Make m and n
        unsigned.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                      |    6 ++++++
 sysdeps/ieee754/dbl-64/e_pow.c |    3 ++-
 2 files changed, 8 insertions(+), 1 deletions(-)

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