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bpf: bpf_setsockopt: reset sock dst on SO_MARK changes

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[ Upstream commit f4924f24da ]

In sock_setsockopt() (net/core/sock.h), when SO_MARK option is used
to change sk_mark, sk_dst_reset(sk) is called. The same should be
done in bpf_setsockopt().

Fixes: 8c4b4c7e9f ("bpf: Add setsockopt helper function to bpf")
Reported-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Peter Oskolkov <posk@google.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Peter Oskolkov
2019-01-16 08:47:54 -08:00
committed by Greg Kroah-Hartman
parent 0761f58c62
commit 8b92162f4e
1 changed files with 4 additions and 1 deletions
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5
net/core/filter.c
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@@ -3930,7 +3930,10 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
sk->sk_rcvlowat = val ? : 1;
break;
case SO_MARK:
sk->sk_mark = val;
if (sk->sk_mark != val) {
sk->sk_mark = val;
sk_dst_reset(sk);
}
break;
default:
ret = -EINVAL;