Null pointer deference in XGetWMHints() of Xfig

[Meng Ruijie <ruijie_meng () u nus edu>]

[Vulnerability description]
Xfig v3.2.8 was discovered to contain a segmentation violation via the function XGetWMHints().

[VulnerabilityType Other]
null pointer deference

[Vendor of Product]
SourceForge

[Affected Product Code Base]
Xfig - 3.2.8

[Reference]
https://sourceforge.net/p/mcj/tickets/155/

[CVE Reference]
The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CVE-2023-45920 to this 
vulnerability.
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