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Fix BedJet setup priority [fixes esphome/issues#3807] (#4677)

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There is a race condition where a BedJet unit previously had its BLE
"notify" flag enabled, and it continues to broadcast these notify
packets even after the ESP32 (and BLEClient) goes away, such as during
a crash or unplugging power.

BLEClient::setup_priority=AFTER_BLUETOOTH, while
BedJetHub::setup_priority=AFTER_WIFI. When the ESP32 starts back up
again, BLEClient::setup() happens first and will start receiving the
BLE notify packets almost immediately. Since we register the BLEClient
child from codegen, BedJetHub is registered as a child already by this
point, so BLEClient dispatches the notify status packet (and other gatt
events) to the BedJetHub handler, even though BedJetHub::setup() has
not been called yet.

We initialize BedJetHub::codec_ in setup(), so if BLEClient starts
dispatching gatt events before setup() is called, then codec_ will not
be initialized yet. This causes BedJetHub's gatt notify handler to call
`this->codec_->decode_notify()` on an uninitialized null pointer. Since
invoking a method does not have to dereference the pointer, that method
invocation is allowed; but later trying to access memory on that
instance results in a StoreProhibited panic.

Changing the BedJetHub's setup_priority to BLUETOOTH causes it to be
setup before BLEClient, so that by the time BLEClient starts to receive
BLE packets, BedJetHub is ready to receive them.
This commit is contained in:
Joe 2023-04-12 04:33:15 -04:00 committed by GitHub
parent 0b9e8fda34
commit 7963abb27a
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1 changed files with 1 additions and 1 deletions
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esphome/components/bedjet/bedjet_hub.h
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@ -116,7 +116,7 @@ class BedJetHub : public esphome::ble_client::BLEClientNode, public PollingCompo
void update() override;
void dump_config() override;
void setup() override { this->codec_ = make_unique<BedjetCodec>(); }
float get_setup_priority() const override { return setup_priority::AFTER_WIFI; }
float get_setup_priority() const override { return setup_priority::BLUETOOTH; }
/** @return The BedJet's configured name, or the MAC address if not discovered yet. */
std::string get_name() {