Linux kernel 4.19 and below misses the patch - "fbmem: add margin check to fb_check_caps()"

Hi stable maintainers,

It seems that Linux kernel 4.19 and below miss the patch - "fbmem: add margin check to fb_check_caps()" [1]. Linux kernel 5.4 and up is already merged this patch[2].

Are there any special issues about this patch? Why do maintainers miss such a patch?

If I have any misunderstanding, please let me know.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

[2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=l...

-- My best regards to you.

No System Is Safe! Dongliang Mu