The validation code modified by commit 5b5e7a0de2bb ("net: metrics: add proper netlink validation") is organised differently in older kernel versions. The fib_convert_metrics() function that is modified in the backports to 4.4 and 4.9 needs to returns an error code, not a success flag.

Signed-off-by: Ben Hutchings ben.hutchings@codethink.co.uk --- net/ipv4/fib_semantics.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c index 9d144cbd4e62..03ebff3950d8 100644 --- a/net/ipv4/fib_semantics.c +++ b/net/ipv4/fib_semantics.c @@ -980,7 +980,7 @@ fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) return -EINVAL; } else { if (nla_len(nla) != sizeof(u32)) - return false; + return -EINVAL; val = nla_get_u32(nla); } if (type == RTAX_ADVMSS && val > 65535 - 40)