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net/tls: take into account that bpf_exec_tx_verdict() may free the record 

bpf_exec_tx_verdict() may free the record if tls_push_record()
fails, or if the entire record got consumed by BPF. Re-check
ctx->open_rec before touching the data.

Fixes: d3b18ad31f ("tls: add bpf support to sk_msg handling")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2019-11-27 12:16:39 -08:00 committed by David S. Miller
parent 81b6b96475
commit c329ef9684
1 changed files with 8 additions and 5 deletions
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13
net/tls/tls_sw.c
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@ -984,7 +984,7 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
num_async++;
else if (ret == -ENOMEM)
goto wait_for_memory;
else if (ret == -ENOSPC)
else if (ctx->open_rec && ret == -ENOSPC)
goto rollback_iter;
else if (ret != -EAGAIN)
goto send_end;
@ -1053,11 +1053,12 @@ int tls_sw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
ret = sk_stream_wait_memory(sk, &timeo);
if (ret) {
trim_sgl:
tls_trim_both_msgs(sk, orig_size);
if (ctx->open_rec)
tls_trim_both_msgs(sk, orig_size);
goto send_end;
}
if (msg_en->sg.size < required_size)
if (ctx->open_rec && msg_en->sg.size < required_size)
goto alloc_encrypted;
}
@ -1190,11 +1191,13 @@ static int tls_sw_do_sendpage(struct sock *sk, struct page *page,
wait_for_memory:
ret = sk_stream_wait_memory(sk, &timeo);
if (ret) {
tls_trim_both_msgs(sk, msg_pl->sg.size);
if (ctx->open_rec)
tls_trim_both_msgs(sk, msg_pl->sg.size);
goto sendpage_end;
}
goto alloc_payload;
if (ctx->open_rec)
goto alloc_payload;
}
if (num_async) {