Re: [PATCH] [BZ #21812] getifaddrs() Don't return ifa entries with NULL names

[Florian Weimer <fweimer@redhat.com>]

On 07/24/2017 10:56 PM, Daniel Alvarez wrote:
> Due to bug 21812, a lookup operation in map_newlink() turns out
> into an insert because of holes in the interface part of the map.
> This leads to incorrectly set the name of the interface to NULL when
> the interface is not present for the address being processed (most
> likely because the interface was added between the RTM_GETLINK and
> RTM_GETADDR calls to the kernel).
> 
> This patch checks this condition and retries the whole operation.
> Hopes are that next time the interface corresponding to the address
> entry is present in the list and correct name is returned.
> 
> Signed-off-by: Daniel Alvarez <dalvarez@redhat.com>

The downstream bug has a different patch:

  <https://bugzilla.redhat.com/show_bug.cgi?id=1472832>

I think using NLM_F_DUMP_INTR to check the inconsistency is preferable
(if it actually works).  glibc requires kernel 3.2 these days, so we can
assume that kernel support is present.

Thanks,
Florian