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Compute the "safe" distance properly #1801

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Merged
merged 1 commit into from
Oct 8, 2024
Merged

Compute the "safe" distance properly #1801

merged 1 commit into from
Oct 8, 2024

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@KungFuJesus
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@KungFuJesus KungFuJesus commented Oct 3, 2024 •
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The safe pointer that is computed is an exclusive, not inclusive bounds. While we were probably rarely ever bit this, if ever, it still makes sense to apply the limit, properly.

Summary by CodeRabbit

  • Bug Fixes

    • Adjusted memory operation parameters for improved performance in the decompression process.

  • Documentation

    • Maintained existing comments and documentation for clarity on function purpose and behavior.

@KungFuJesus
Compute the "safe" distance properly
f80a8bf 
The safe pointer that is computed is an exclusive, not inclusive bounds.
While we were probably rarely ever bit this, if ever, it still makes
sense to apply the limit, properly.
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coderabbitai bot commented Oct 3, 2024 •
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Walkthrough

The changes involve modifications to the inflate_fast function in the inffast.c file, specifically regarding memory operation handling. The adjustment involves removing an unnecessary + 1 from the parameters passed to the CHUNKMEMSET_SAFE function, which impacts how the function calculates the number of bytes to be set during memory operations. The overall structure, logic, and documentation of the function remain unchanged, ensuring that the decompression process's fundamental functionality is preserved.

Changes

File Change Summary
inffast.c Modified inflate_fast function to remove + 1 from the third parameter of CHUNKMEMSET_SAFE, affecting memory operation calculations. Comments and documentation remain unchanged.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant InflateFast
    participant ChunkMemSetSafe

    User->>InflateFast: Call inflate_fast()
    InflateFast->>ChunkMemSetSafe: Call CHUNKMEMSET_SAFE(params)
    ChunkMemSetSafe-->>InflateFast: Memory operation complete
    InflateFast-->>User: Return to user
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coderabbitai[bot]
coderabbitai bot reviewed Oct 3, 2024
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Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 8d10c30 and f80a8bf.

📒 Files selected for processing (1)
  • inffast_tpl.h (1 hunks)
🔇 Additional comments (1)
inffast_tpl.h (1)

263-263: Approve: Correct adjustment for exclusive bounds

This change aligns with the PR objective of computing the 'safe' distance properly. By removing the + 1, the CHUNKMEMSET_SAFE function now uses exclusive bounds instead of inclusive ones. This subtle but crucial adjustment enhances the safety of memory operations by preventing potential buffer overruns.

The modification is correct and improves the overall robustness of the decompression algorithm.

Dead2
Dead2 approved these changes Oct 7, 2024
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LGTM

@Dead2 Dead2 merged commit 3297953 into zlib-ng:develop Oct 8, 2024
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@Dead2 Dead2 Dead2 approved these changes

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@KungFuJesus @Dead2