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Fix: Crash due to use of invalid iterator in ClientNetworkContentSocketHandler #7488

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@JGRennison
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JGRennison commented Apr 8, 2019

In particular this crash can be observed when using the
bootstrap GUI to download the base graphics.

In ClientNetworkContentSocketHandler::OnReceiveContentInfo
ClientNetworkContentSocketHandler::callbacks is iterated, using an iterator
cb->OnReceiveContentInfo() is called (cb is of type BootstrapAskForDownloadWindow)
This calls new BootstrapContentDownloadStatusWindow()
This inherits from BaseNetworkContentDownloadStatusWindow
The constructor of which calls _network_content_client.AddCallback(this)
This reallocates the std::vector which is being iterated in ClientNetworkContentSocketHandler::OnReceiveContentInfo
This results in iter being invalid, and an assertion failure occurs shortly
afterwards due to its use in the next iteration of cb->OnReceiveContentInfo()

Adjust all locations where ClientNetworkContentSocketHandler::callbacks
is iterated to avoid problematic behaviour

…etHandler

In particular this crash can be observed when using the
bootstrap GUI to download the base graphics.

In ClientNetworkContentSocketHandler::OnReceiveContentInfo
ClientNetworkContentSocketHandler::callbacks is iterated, using an iterator
cb->OnReceiveContentInfo() is called (cb is of type BootstrapAskForDownloadWindow)
This calls new BootstrapContentDownloadStatusWindow()
This inherits from BaseNetworkContentDownloadStatusWindow
The constructor of which calls _network_content_client.AddCallback(this)
This reallocates the std::vector which is being iterated in ClientNetworkContentSocketHandler::OnReceiveContentInfo
This results in iter being invalid, and an assertion failure occurs shortly
afterwards due to its use in the next iteration of cb->OnReceiveContentInfo()

Adjust all locations where ClientNetworkContentSocketHandler::callbacks
is iterated to avoid problematic behaviour
@LordAro
LordAro approved these changes Apr 9, 2019
@michicc michicc merged commit 01f957c into OpenTTD:master Apr 9, 2019
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