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This situation is unlikely to happen because data comes from kernel, but it is still safer to pass a correct max parameter to parse_rtattr_nested(). Fix sent upstream:

https://marc.info/?l=linux-netdev&m=155077427004974&w=2

Upstream commit to backport:

commit d7cf2416fc3a08b411beffb93a9e118f6593892d
Author: Phil Sutter <phil>
Date:   Thu Feb 21 19:37:51 2019 +0100

    ip-address: Use correct max attribute value in print_vf_stats64()
    
    IFLA_VF_MAX is larger than the highest valid index in vf array.
    
    Fixes: a1b99717c7cd7 ("Add displaying VF traffic statistics")
    Signed-off-by: Phil Sutter <phil>
    Signed-off-by: Stephen Hemminger <stephen>

Hi Phil,

do you have some testing instruction for this bug?

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:2131