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channeld: don't fail channel on unknown code in update_fail_malformed_htlc.

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We will probably not add another BADONION code, but this is safer.

Suggested-by: @cdecker
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-01-08 11:23:26 +10:30 committed by Christian Decker
parent 7e8dbc1c37
commit 55e8634a1f
1 changed files with 12 additions and 5 deletions
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17
channeld/channeld.c
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@ -1605,16 +1605,23 @@ static void handle_peer_fail_malformed_htlc(struct peer *peer, const u8 *msg)
* `update_fail_malformed_htlc`:
* - MUST fail the channel.
*/
/* We only handle these cases. */
if (failure_code != WIRE_INVALID_ONION_VERSION
&& failure_code != WIRE_INVALID_ONION_HMAC
&& failure_code != WIRE_INVALID_ONION_KEY) {
if (!(failure_code & BADONION)) {
peer_failed(&peer->cs,
&peer->channel_id,
"Bad update_fail_malformed_htlc failure code %u",
failure_code);
}
assert(failure_code & BADONION);
/* We only handle these cases in make_failmsg, so convert any
* (future?) unknown one. */
if (failure_code != WIRE_INVALID_ONION_VERSION
&& failure_code != WIRE_INVALID_ONION_HMAC
&& failure_code != WIRE_INVALID_ONION_KEY) {
status_unusual("Unknown update_fail_malformed_htlc code %u:"
" sending temporary_channel_failure",
failure_code);
failure_code = WIRE_TEMPORARY_CHANNEL_FAILURE;
}
e = channel_fail_htlc(peer->channel, LOCAL, id, &htlc);
switch (e) {