CVE-2023-25733

The return value from `gfx::SourceSurfaceSkia::Map()` wasn't being verified which could have potentially lead to a null pointer dereference. This vulnerability affects Firefox < 110.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1808632
  Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2023-05/
  Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1808632
  Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2023-05/
  Vendor Advisory