[Pkg-gmagick-im-team] Bug#870105: Lack of validation of png file

[Bastien ROUCARIES]

Source: imagemagick
Version: 8:6.9.7.4+dfsg-13
Severity: important
Tags: security upstream
X-Debbugs-CC: team at security.debian.org
control: found -1 8:6.8.9.9-5+deb8u8
control: found -1 8:6.8.9.9-5+deb8u9
control: found -1 8:6.7.7.10-5+deb7u14
control: found -1 8:6.7.7.10-5+deb9u1


Validate png file

    Detected corrupted png early and avoid a crash

    it is the merge of two upstream patch
    aa84944b405acebbeefe871d0f64969b9e9f31ac and
    46e3aabbf8d59a1bdebdbb65acb9b9e0484577d3