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src: fix inspecting MessagePort from init async hook #31600

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@addaleax addaleax commented Feb 1, 2020

During the init() async hook, the C++ object is not finished
creating yet (i.e. it is an AsyncWrap, but not yet a HandleWrap
or MessagePort). Accessing the handle_ field is not valid
in that case.

However, the custom inspect function for MessagePorts calls
HasRef() on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@addaleax addaleax added async_hooks Issues and PRs related to the async hooks subsystem. worker Issues and PRs related to Worker support. lts-watch-v12.x labels Feb 1, 2020
@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Feb 1, 2020
During the `init()` async hook, the C++ object is not finished
creating yet (i.e. it is an `AsyncWrap`, but not yet a `HandleWrap`
or `MessagePort`). Accessing the `handle_` field is not valid
in that case.

However, the custom inspect function for `MessagePort`s calls
`HasRef()` on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.
@addaleax addaleax force-pushed the messageport-init-inspect branch from 6794b9e to 95138dc Compare February 1, 2020 12:42
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@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Feb 4, 2020
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addaleax added a commit that referenced this pull request Feb 5, 2020
During the `init()` async hook, the C++ object is not finished
creating yet (i.e. it is an `AsyncWrap`, but not yet a `HandleWrap`
or `MessagePort`). Accessing the `handle_` field is not valid
in that case.

However, the custom inspect function for `MessagePort`s calls
`HasRef()` on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.

PR-URL: #31600
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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addaleax commented Feb 5, 2020

Landed in c1da4e4

@addaleax addaleax closed this Feb 5, 2020
@addaleax addaleax deleted the messageport-init-inspect branch February 5, 2020 14:52
codebytere pushed a commit that referenced this pull request Feb 17, 2020
During the `init()` async hook, the C++ object is not finished
creating yet (i.e. it is an `AsyncWrap`, but not yet a `HandleWrap`
or `MessagePort`). Accessing the `handle_` field is not valid
in that case.

However, the custom inspect function for `MessagePort`s calls
`HasRef()` on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.

PR-URL: #31600
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@codebytere codebytere mentioned this pull request Feb 17, 2020
codebytere pushed a commit that referenced this pull request Mar 15, 2020
During the `init()` async hook, the C++ object is not finished
creating yet (i.e. it is an `AsyncWrap`, but not yet a `HandleWrap`
or `MessagePort`). Accessing the `handle_` field is not valid
in that case.

However, the custom inspect function for `MessagePort`s calls
`HasRef()` on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.

PR-URL: #31600
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
codebytere pushed a commit that referenced this pull request Mar 17, 2020
During the `init()` async hook, the C++ object is not finished
creating yet (i.e. it is an `AsyncWrap`, but not yet a `HandleWrap`
or `MessagePort`). Accessing the `handle_` field is not valid
in that case.

However, the custom inspect function for `MessagePort`s calls
`HasRef()` on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.

PR-URL: #31600
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
@codebytere codebytere mentioned this pull request Mar 17, 2020
codebytere pushed a commit that referenced this pull request Mar 30, 2020
During the `init()` async hook, the C++ object is not finished
creating yet (i.e. it is an `AsyncWrap`, but not yet a `HandleWrap`
or `MessagePort`). Accessing the `handle_` field is not valid
in that case.

However, the custom inspect function for `MessagePort`s calls
`HasRef()` on the object, which would crash when the object
is not fully constructed. Fix that by guarding the access of
the libuv handle on that condition.

PR-URL: #31600
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
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6 participants