Hi,
upstream commit 41fc014332d91ee90c32840bf161f9685b7fbf2b has a small flaw. Before the patch, the loop in dump_rules (line 627 - 638, fib_rules.c) was canceled if fib_nl_fill_rule returns a value less than zero, after the patch it is canceled if fib_nl_fill_rule returns a nonzero value. But without errors fib_nl_fill_rule will return skb-> len. So I thing the termination condition should be "if (err < 0) break;" not "if (err) break;".
This error leads to OOM - Exceptions in our system with program "ip"! After changing the code to "if (err < 0) break;" everything works fine.

 
Regards, Markus