Potential fix for code scanning alert no. 7: Multiplication result converted to larger type

[mooch443]

Potential fix for https://github.com/mooch443/trex/security/code-scanning/7

Compute image byte size using size_t and cast operands before multiplication so the arithmetic is performed in the larger type. Then pass that size_t to allocation and copy.

Best fix in this snippet:

• In Application/src/grabber/gif.h, inside GifMakePalette(...), replace:
  • int imageSize = width*height*4*sizeof(uint8_t);
    with
  • size_t imageSize = static_cast<size_t>(width) * static_cast<size_t>(height) * 4u * sizeof(uint8_t);
• Keep GIF_TEMP_MALLOC(imageSize) and memcpy(..., imageSize) using this size_t value.
• No new imports are needed (size_t is already available via existing C headers in this file context).

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

Summary by CodeRabbit

• Bug Fixes
  • Fixed a potential memory overflow vulnerability in GIF image processing that could cause application crashes or unexpected behavior, enhancing overall stability.

[coderabbitai]

📝 Walkthrough

Walkthrough

The GIF palette generation function upgrades its temporary buffer size calculation from signed int arithmetic to unsigned size_t, using explicit static_cast and unsigned literal 4u to prevent integer overflow. The computed size is used consistently for memory allocation and data copying.

Changes

Buffer Overflow Fix

Layer / File(s)	Summary
Size calculation overflow prevention Application/src/grabber/gif.h	Buffer size computation in GifMakePalette replaces int-based arithmetic with size_t and explicit static_cast to avoid overflow on width*height*4 multiplication, used for both temporary buffer allocation and copy operations.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A buffer once risked overflow's plight,
With ints that would truncate and twist,
But size_t and cast make the math now right,
No more integer wrap on the list! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main objective of the PR: addressing a code scanning alert about multiplication overflow by using proper type casting.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch alert-autofix-7

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 0

Caution

Some comments are outside the diff and can’t be posted inline due to platform limitations.

⚠️ Outside diff range comments (1)

Application/src/grabber/gif.h (1)

358-358: ⚠️ Potential issue | 🟠 Major | ⚡ Quick win

Similar overflow risk on adjacent line.

Line 358 has the same overflow issue that was just fixed on line 354: int numPixels = width*height; performs 32-bit multiplication before assignment. For large images (e.g., 50000×50000), this can overflow since the result exceeds INT_MAX (≈2.1 billion).

Consider applying a similar fix:

🔒 Proposed fix to prevent overflow

-    int numPixels = width*height;
+    int numPixels = static_cast<int>(static_cast<size_t>(width) * static_cast<size_t>(height));

Or, preferably, use an unsigned type since pixel counts are non-negative:

-    int numPixels = width*height;
+    size_t numPixels = static_cast<size_t>(width) * static_cast<size_t>(height);

Note: If changing to size_t, verify that all downstream uses of numPixels (lines 360, 366) handle size_t correctly.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@Application/src/grabber/gif.h` at line 358, The multiplication for numPixels
(int numPixels = width*height;) can overflow 32-bit; change the type to size_t
(or uint64_t) and cast operands so the multiplication is performed in the wider
unsigned type (e.g., size_t numPixels = (size_t)width * (size_t)height) and
update any downstream uses in the surrounding function where numPixels is
referenced (see uses around the next lines ~360 and ~366) to accept size_t;
ensure any APIs or arithmetic that expect int are adjusted or explicitly cast
where safe.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Outside diff comments:
In `@Application/src/grabber/gif.h`:
- Line 358: The multiplication for numPixels (int numPixels = width*height;) can
overflow 32-bit; change the type to size_t (or uint64_t) and cast operands so
the multiplication is performed in the wider unsigned type (e.g., size_t
numPixels = (size_t)width * (size_t)height) and update any downstream uses in
the surrounding function where numPixels is referenced (see uses around the next
lines ~360 and ~366) to accept size_t; ensure any APIs or arithmetic that expect
int are adjusted or explicitly cast where safe.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0fc1cb5c-7779-470a-97e4-b28e267d4d11

📥 Commits

Reviewing files that changed from the base of the PR and between fc06a82 and 2b8ae0e.

📒 Files selected for processing (1)

• Application/src/grabber/gif.h