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src: check for empty maybe local #32339

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src: check for empty maybe local #32339

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Xstoudi
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@Xstoudi Xstoudi commented Mar 18, 2020

Using ToLocalChecked on MaybeLocal without verify it's empty can lead to unattempted crash.

Before the change: this code leads Node.js to crash with C++ fatal error.

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

@nodejs-github-bot nodejs-github-bot added c++ Issues and PRs that require attention from people who are familiar with C++. dgram Issues and PRs related to the dgram subsystem / UDP. labels Mar 18, 2020
src/udp_wrap.cc Outdated
Comment on lines 519 to 521
MaybeLocal<Value> maybe_chunk = chunks->Get(env->context(), i);
if (maybe_chunk.IsEmpty()) return;
Local<Value> chunk = maybe_chunk.ToLocalChecked();
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@himself65 himself65 Mar 18, 2020

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Suggested change
MaybeLocal<Value> maybe_chunk = chunks->Get(env->context(), i);
if (maybe_chunk.IsEmpty()) return;
Local<Value> chunk = maybe_chunk.ToLocalChecked();
Local<Value> chunk;
if (!chunks->Get(env->context(), i).ToLocal(&chunk))
return;

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Not really sure about the value added by a test on this really really edge case.

Using ToLocalChecked on MaybeLocal without verifying it's empty can lead to unattempted crash.
@jasnell jasnell requested a review from addaleax March 18, 2020 23:40
@targos targos added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Mar 20, 2020
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addaleax pushed a commit that referenced this pull request Mar 27, 2020
Using ToLocalChecked on MaybeLocal without verifying it's empty
can lead to unattempted crash.

PR-URL: #32339
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: David Carlier <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: James M Snell <[email protected]>
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Landed in 191fb3c, thanks for the PR! 🎉

@addaleax addaleax closed this Mar 27, 2020
addaleax pushed a commit that referenced this pull request Mar 30, 2020
Using ToLocalChecked on MaybeLocal without verifying it's empty
can lead to unattempted crash.

PR-URL: #32339
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: David Carlier <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: James M Snell <[email protected]>
targos pushed a commit that referenced this pull request Apr 22, 2020
Using ToLocalChecked on MaybeLocal without verifying it's empty
can lead to unattempted crash.

PR-URL: #32339
Reviewed-By: Michaël Zasso <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: David Carlier <[email protected]>
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: James M Snell <[email protected]>
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8 participants