libX11: Changes to 'master'

[Matthieu Herrb]

 src/FontNames.c |   23 +++++++++++++++++------
 src/GetImage.c  |   29 ++++++++++++++++++++---------
 src/ListExt.c   |   12 ++++++++----
 src/ModMap.c    |    3 ++-
 4 files changed, 47 insertions(+), 20 deletions(-)

New commits:
commit 8ea762f94f4c942d898fdeb590a1630c83235c17
Author: Tobias Stoeckmann <tobias at stoeckmann.org>
Date:   Sun Sep 25 21:25:25 2016 +0200

    Validation of server responses in XGetImage()
    
    Check if enough bytes were received for specified image type and
    geometry. Otherwise GetPixel and other functions could trigger an
    out of boundary read later on.
    
    Signed-off-by: Tobias Stoeckmann <tobias at stoeckmann.org>
    Reviewed-by: Matthieu Herrb <matthieu at herrb.eu>

commit 8c29f1607a31dac0911e45a0dd3d74173822b3c9
Author: Tobias Stoeckmann <tobias at stoeckmann.org>
Date:   Sun Sep 25 21:22:57 2016 +0200

    The validation of server responses avoids out of boundary accesses.
    
    v2: FontNames.c  return a NULL list whenever a single
    length field from the server is incohent.
    
    Signed-off-by: Tobias Stoeckmann <tobias at stoeckmann.org>
    Reviewed-by: Matthieu Herrb <matthieu at herrb.eu>