Bluetooth: Host: Fix resource leak in bt_gatt_unsubscribe
There are two simmilar functions for unsubscribing from GATT handles.
- `gatt_sub_remove`, which is called on disconnect for every
subscription will free the `subscriptions` entry when the entry
represents no subscriptions.
- `bt_gatt_unsubscribe`, called by the application, which forgets to
free the `subscriptions` entry.
If all subscriptions grouped in a `subscriptions` entry are removed
using `bt_gatt_unsubscribe` before disconnect, there are no
subscriptions left to call `gatt_sub_remove` on. The `subscriptions`
entry is then never freed.
The above results in a resource leak of a `subscriptions` entry.
This fix makes explicit and enforces the invariant that there should not
be entries in `subscriptions` with an empty subscription list.
Fixes #38688
Signed-off-by: Aleksander Wasaznik <aleksander.wasaznik@nordicsemi.no>
1 file changed
