Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

src: fix integer overflow in GetNow #22214

Closed
wants to merge 1 commit into from
Closed

src: fix integer overflow in GetNow #22214

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion src/env.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -617,7 +617,7 @@ Local<Value> Environment::GetNow() {
CHECK_GE(now, timer_base());
now -= timer_base();
if (now <= 0xffffffff)
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Should this have an U suffix…?

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

It shouldn't matter in this case, right? I thought they were equivalent since this won't fit into an int and the next type is unsigned int.

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Okay, I looked it up – without the suffix it is still signed, but it’s a long int in that case, so we’re probably fine here. :)

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Does this mean that the bug still exists for numbers in 2^31 .. 2^32 range?

Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

@nkbt This PR fixed the bug for those numbers – all others should remain the same

Copy link

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Thanks, I was not sure if NewFromUnsigned does exactly that

return Integer::New(isolate(), static_cast<uint32_t>(now));
return Integer::NewFromUnsigned(isolate(), static_cast<uint32_t>(now));
else
return Number::New(isolate(), static_cast<double>(now));
}
Expand Down