CVE-2025-38215 fbdev: Fix do_register_framebuffer to prevent null-ptr-deref in fb_videomode_to_var

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Microsoft Fixes Null Pointer Dereference Vulnerabilities in fbdev Microsoft has published information regarding two vulnerabilities in the fbdev subsystem, identified as CVE-2025-38214 and CVE-2025-38215. Both vulnerabilities involve null pointer dereference issues in the fb_videomode_to_var function, which could potentially lead to system instability. The vulnerabilities were published on July 4, 2025, and have now been addressed with fixes. 2 sources 39