[Bug regex/18040] use-after-free in regexec/get_subexp

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=18040

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ef202e530c2384d6a47951ed1c6b63ed945e462f

commit ef202e530c2384d6a47951ed1c6b63ed945e462f
Author: Paul Eggert <eggert@cs.ucla.edu>
Date:   Wed Sep 5 23:57:08 2018 -0700

    regex: fix storage-exhaustion error

    [BZ #18040]
    * posix/regexec.c (get_subexp):
    Do not continue if storage is exhausted.

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=077caf61d867d4cab49b5aa42da1611868596fe7

commit 077caf61d867d4cab49b5aa42da1611868596fe7
Author: Assaf Gordon <assafgordon@gmail.com>
Date:   Wed Sep 5 23:25:07 2018 -0700

    regex: fix heap-use-after-free error

    [BZ #18040]
    Problem reported by Saito Takaaki <tails.saito@gmail.com> in
    https://debbugs.gnu.org/32592
    Call stack get_subexp->get_subexp_sub->clean_state_log_if_needed may
    call extend_buffers which reallocates the re_string_t internal buffer.
    Local variable 'buf' was not updated in such case, resulting in
    use-after-free.
    * posix/regexec.c (get_subexp): Update 'buf' after call to
    get_subexp_sub.

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

Summary of changes:
 ChangeLog       |   20 ++++++++++++++++++++
 posix/regexec.c |    3 +++
 2 files changed, 23 insertions(+), 0 deletions(-)

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