selinux: Use an other error code for an input validation failure in sidtab_insert()

[SF Markus Elfring]

> Have you tested this to determine any impact it may have on the
> SELinux userspace?

Not yet.


> I would agree that EINVAL is probably more appropriate in this case,

Thanks that a part of your view seems to fit also to mine.


> but changing this return code has very little value

I would appreciate if this aspect can clarified a bit more.


> and may disrupt userspace if it assumes EINVAL means something else
> when the policy load fails.

Would you find an other error code better there?

Do you care to distinguish an input validation failure in a specific
function implementation from other error situations?

Regards,
Markus
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