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net/tls: use RCU protection on icsk->icsk_ulp_data

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We need to make sure context does not get freed while diag
code is interrogating it. Free struct tls_context with
kfree_rcu().

We add the __rcu annotation directly in icsk, and cast it
away in the datapath accessor. Presumably all ULPs will
do a similar thing.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-08-30 12:25:47 +02:00 • committed by David S. Miller
parent ed6e8103ba
commit 15a7dea750
5 changed files with 29 additions and 12 deletions
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2
net/core/sock_map.c
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@ -345,7 +345,7 @@ static int sock_map_update_common(struct bpf_map *map, u32 idx,
return -EINVAL;
if (unlikely(idx >= map->max_entries))
return -E2BIG;
if (unlikely(icsk->icsk_ulp_data))
if (unlikely(rcu_access_pointer(icsk->icsk_ulp_data)))
return -EINVAL;
link = sk_psock_init_link();