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Fixes buffer overflow vulnerabilities in png_get_PLTE/png_set_PLTE functions
References:
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2015-8126
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-8126
Upstream patches:
https://github.com/glennrp/libpng/commit/81f44665cce4cb1373f049a76f3904e981b7a766
https://github.com/glennrp/libpng/commit/a901eb3ce6087e0afeef988247f1a1aa208cb54d
https://github.com/glennrp/libpng/commit/1bef8e97995c33123665582e57d3ed40b57d5978
https://github.com/glennrp/libpng/commit/83f4c735c88e7f451541c1528d8043c31ba3b466
Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Paul Vaduva <Paul.Vaduva@enea.com>
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