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Use checked_sub to avoid index out of bounds #5129

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merged 1 commit into from
Feb 3, 2020

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JohnTitor
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@JohnTitor JohnTitor commented Feb 3, 2020

(Fixes) #4681 (possibly)

The issue likely occurs due to lit_snip.len() < suffix.len() + 1. You can see similar backtrace to change it to lit_snip.len() - suffix.len() - 1000 or something then run cargo test --release.
But I couldn't come up with the test so I'd leave the issue open if we want.

changelog: Fix potential ICE in misc_early

@JohnTitor JohnTitor added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Feb 3, 2020
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flip1995 commented Feb 3, 2020

@bors r+

Let's leave the issue open and ping @arturoc to test it, once it lands in nightly. This change is an improvement either way.

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bors commented Feb 3, 2020

📌 Commit bae129a has been approved by flip1995

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bors commented Feb 3, 2020

⌛ Testing commit bae129a with merge a395894...

bors added a commit that referenced this pull request Feb 3, 2020
Use `checked_sub` to avoid index out of bounds

(Fixes) #4681 (possibly)

The issue likely occurs due to `lit_snip.len() < suffix.len() + 1`. You can see similar backtrace to change it to `lit_snip.len() - suffix.len() - 1000` or something then run `cargo test --release`.
But I couldn't come up with the test so I'd leave the issue open if we want.

changelog: Fix potential ICE in `misc_early`
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bors commented Feb 3, 2020

☀️ Test successful - checks-travis, status-appveyor
Approved by: flip1995
Pushing a395894 to master...

@bors bors merged commit bae129a into rust-lang:master Feb 3, 2020
@JohnTitor JohnTitor deleted the use-checked-sub branch February 3, 2020 17:23
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3 participants