[Bug network/20010] getaddrinfo: Stack overflow in hostent translation (CVE-2016-3706)

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=20010

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1a8a7c12950a0026a3c406a7cb1608f96aa1460e

commit 1a8a7c12950a0026a3c406a7cb1608f96aa1460e
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Apr 29 10:35:34 2016 +0200

    CVE-2016-3706: getaddrinfo: stack overflow in hostent conversion [BZ
#20010]

    When converting a struct hostent response to struct gaih_addrtuple, the
    gethosts macro (which is called from gaih_inet) used alloca, without
    malloc fallback for large responses.  This commit changes this code to
    use calloc unconditionally.

    This commit also consolidated a second hostent-to-gaih_addrtuple
    conversion loop (in gaih_inet) to use the new conversion function.

    (cherry picked from commit 4ab2ab03d4351914ee53248dc5aef4a8c88ff8b9)

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

Summary of changes:
 ChangeLog                   |   10 +++
 sysdeps/posix/getaddrinfo.c |  130 +++++++++++++++++++++++--------------------
 2 files changed, 79 insertions(+), 61 deletions(-)

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