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Summary of ChangesHello @tony84727, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request introduces a new Rust solution for a LeetCode problem, focusing on efficiently identifying the presence of all possible binary codes of a given length within a string. The changes include the core algorithm implementation, associated documentation, and updates to the module structure to incorporate the new functionality and maintain organization. Highlights
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Code Review
This pull request introduces a Rust solution for the LeetCode problem "Check If a String Contains All Binary Codes of Size K". While the solution is well-implemented, utilizing a HashSet and efficient bit manipulation with a sliding window approach, it currently lacks input validation for the parameters s and k. This omission could lead to Denial of Service (DoS) via memory exhaustion (OOM) or application panics (integer underflow/overflowing shifts), specifically if k is excessively large or s is too short relative to k. Unit tests are provided, and the README.md and src/leetcode/mod.rs updates are appropriate.
| let k = k as usize; | ||
| let goal = 1 << k; | ||
| if s.len() - k + 1 < goal { | ||
| return false; | ||
| } | ||
| let mut codes = HashSet::with_capacity(goal); |
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The code is vulnerable to Denial of Service (DoS) in several ways:
- Out-of-Memory (OOM):
HashSet::with_capacity(goal)wheregoal = 1 << kcan attempt to allocate a massive amount of memory ifkis large. - Integer Underflow:
s.len() - kwill panic ifs.len() < k. - Overflowing Shift:
1 << kand other shifts will panic ifkis 32 or greater (fori32) or 64 or greater (forusizeon 64-bit systems).
Validation should be added to ensure k is within a reasonable range (e.g., 1 to 20 as per the problem constraints) and that s.len() >= k before performing subtraction.
| let k = k as usize; | |
| let goal = 1 << k; | |
| if s.len() - k + 1 < goal { | |
| return false; | |
| } | |
| let mut codes = HashSet::with_capacity(goal); | |
| if k < 1 || k > 20 { | |
| return false; | |
| } | |
| let k = k as usize; | |
| let goal = 1 << k; | |
| if s.len() < k || s.len() - k + 1 < goal { | |
| return false; | |
| } | |
| let mut codes = HashSet::with_capacity(goal); |
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Reviewed commit: 5a8c14cba1
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| pub fn has_all_codes(s: String, k: i32) -> bool { | ||
| let k = k as usize; | ||
| let goal = 1 << k; | ||
| if s.len() - k + 1 < goal { |
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The condition s.len() - k + 1 < goal underflows when k > s.len(), so valid inputs like s = "0", k = 2 panic in debug builds instead of returning false. This path is reachable before any early return, which makes the implementation crash on an expected edge case; add an explicit s.len() < k guard (or checked arithmetic) before performing the subtraction.
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