Re: [PATCH] ip6_offload: check segs for NULL in ipv6_gso_segment.

[Eric Dumazet]

On Thu, 2016-12-01 at 16:07 +0100, Artem Savkov wrote:

> I am not, but this would have the same behavior as pre-07b26c9 code and
> IS_ERR_OR_NULL is used in ipv4's inet_gso_segment().

My concern might have been that IS_ERR_OR_NULL() considers the !ptr to
be unlikely.

But in this code path, we really can not tell.

segs == NULL can be quite likely in TUN case, because of DODGY bit

Commit 50c3a487d50756 replaced the perfectly fine :

if (!segs || IS_ERR(segs))

into dubious

if (IS_ERR_OR_NULL(segs))

segs = NULL is not an error, but use of IS_ERR_OR_NULL() might mislead
programmers trying to understand this code.