[Bug libc/23913] off-by-one in function maybe_script_execute in sysdeps/posix/spawni.c

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https://sourceware.org/bugzilla/show_bug.cgi?id=23913

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=f5ec0ea9eaf9753188a0bfa391b101ea8d5efc2b

commit f5ec0ea9eaf9753188a0bfa391b101ea8d5efc2b
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Mon Dec 3 18:20:26 2018 -0200

    posix: Fix segfault in maybe_script_execute

    This patch is essentially 28669f86f6 adjusted for the generic
    implementation.

    Checked on x86_64-linux-gnu with Linux spawni.c removed.  The only
    failure is posix/tst-spawn3, which is expected.

        [BZ #23913]
        * sysdeps/posix/spawni.c (maybe_script_execute):
        Increment size of new_argv by one.

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

Summary of changes:
 ChangeLog              |    6 ++++++
 sysdeps/posix/spawni.c |    2 +-
 2 files changed, 7 insertions(+), 1 deletions(-)

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