fix: check line table bounds

[korniltsev]

Inspirations:
benfred#755
benfred#736

• fix oob read panic
• fix debug int overflow panics
• add fuzzer

[Copilot]

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (2)

src/stack_trace.rs:252

• [nitpick] Consider providing additional context in the error message (for example, including the value of 'lasti') so that debugging failures in line number lookup becomes easier.

.or_else(|err| bail!("Failed to get line number {err:?}"))

src/line_numbers.rs:4

• [nitpick] Consider implementing Display and std::error::Error for the Error type to supply more useful information when errors occur.

pub struct Error;

[korniltsev]

added a fuzzer, imediately found more problems

stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/0fe8f3454dbe9dda52a254991347e96bec579a6f/library/std/src/panicking.rs:697:5
   1: core::panicking::panic_fmt
             at /rustc/0fe8f3454dbe9dda52a254991347e96bec579a6f/library/core/src/panicking.rs:75:14
   2: core::panicking::panic_const::panic_const_sub_overflow
             at /rustc/0fe8f3454dbe9dda52a254991347e96bec579a6f/library/core/src/panicking.rs:178:21
   3: <py_spy::python_bindings::v3_13_0::PyCodeObject as py_spy::python_interpreters::CodeObject>::get_line_number
             at ./src/python_interpreters.rs:281:29
   4: py_spy::python_interpreters::tests::test_line_numbers
             at ./src/python_interpreters.rs:879:21
   5: py_spy::python_interpreters::tests::test_line_numbers::{{closure}}
             at ./src/python_interpreters.rs:793:27
   6: core::ops::function::FnOnce::call_once

[Copilot]

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

Files not reviewed (1)

• fuzz/.gitignore: Language not supported

[kolesnikovae]

LGTM