Re: [PATCH v2] vsock: ignore empty child namespace mode writes

Hi Luigi, Stefano,

Thanks for taking a look.

Luigi — nothing fancy, I was just reading sysctl handlers and
noticed that __vsock_net_mode_string() bails early on a zero-length
write without touching new_mode. Since the child mode can only be
set once, an empty write that sneaks through locks it with whatever
was on the stack. CONFIG_INIT_STACK_ALL_ZERO hides the whole thing,
which is probably why nobody hit it in practice.

Stefano — yeah, makes more sense to bail before calling the helper
at all. Fixed in v3, and I added the CCs I missed.

Cheers,
Aldo