Re: UBSAN reports issue in ip_idents_reserve

On Tue, 2016-09-20 at 13:36 +0000, David Laight wrote:

From: Eric Dumazet

quoted

Sent: 20 September 2016 14:29

...

quoted

quoted

[   47.565420] -2117905507 + -695755206 cannot be represented in type 'int'

...

quoted

I do not think we have to worry here.

These is best effort, and unfortunately atomic_t are int.

Not until we compile on a cpu where int arithmetic doesn't wrap.

Then I guess the guy adding this kind of arches in the kernel will have
to add all the core kernel infra.

If you have an idea, I will happily review a patch.