fib, fib6: reject invalid feature bits
Feature bits that are invalid should not be accepted by the kernel,
only the lower 4 bits may be configured, but not the remaining ones.
Even from these 4, 2 of them are unused.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0261b72..8771530 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1728,6 +1728,8 @@
} else {
val = nla_get_u32(nla);
}
+ if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
+ goto err;
mp[type - 1] = val;
__set_bit(type - 1, mxc->mx_valid);