From: David Ahern <[email protected]> Verify flags argument contains only known flags. Allows programs to probe for support as more are added.
Signed-off-by: David Ahern <[email protected]> --- net/core/filter.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/core/filter.c b/net/core/filter.c index 24e6ce8be567..4cff6d9cd724 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4270,6 +4270,9 @@ BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, if (plen < sizeof(*params)) return -EINVAL; + if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) + return -EINVAL; + switch (params->family) { #if IS_ENABLED(CONFIG_INET) case AF_INET: @@ -4304,6 +4307,9 @@ BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, if (plen < sizeof(*params)) return -EINVAL; + if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) + return -EINVAL; + switch (params->family) { #if IS_ENABLED(CONFIG_INET) case AF_INET: -- 2.11.0
