[CVE-2018-19763] heap-based buffer over-read at writer.c (function: write_png_to_file)

[nluedtke]

Re-posting this here to make sure you are aware.

https://nvd.nist.gov/vuln/detail/CVE-2018-19763
https://bugzilla.redhat.com/show_bug.cgi?id=1649201

[fgeek]

@nluedtke Thank you for your efforts. I appreciate it.

[saitoha]

Fix for this problem #95 is merged into v1.8.3. Thanks.