bpf: add bpf_clone_redirect to bpf_helper_changes_pkt_data

[ Upstream commit 41703a731066fde79c3e5ccf3391cf77a98aeda5 ]

The bpf_clone_redirect() still needs to be listed in
bpf_helper_changes_pkt_data() since we call into
bpf_try_make_head_writable() from there, thus we need
to invalidate prior pkt regs as well.

Fixes: 36bbef52c7eb ("bpf: direct packet write and access for helpers for clsact progs")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/core/filter.c b/net/core/filter.c
index b391209..4eb4ce0 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2198,6 +2198,7 @@ bool bpf_helper_changes_skb_data(void *func)
            func == bpf_skb_change_proto ||
            func == bpf_skb_change_tail ||
            func == bpf_skb_pull_data ||
+           func == bpf_clone_redirect ||
            func == bpf_l3_csum_replace ||
            func == bpf_l4_csum_replace)
                return true;