fix: add integer overflow check in magic_kernel_sharp.c

[anupamme]

Summary

Fix high severity security issue in scrape/magic_kernel_sharp.c.

Vulnerability

Field	Value
ID	V-002
Severity	HIGH
Scanner	multi_agent_ai
Rule	V-002
File	scrape/magic_kernel_sharp.c:162
Assessment	Likely exploitable
CWE	CWE-190

Description: Memory allocation calculations in magic_kernel_sharp.c multiply size_t values without overflow checking. Large image dimensions can cause integer overflow, resulting in undersized allocations. Subsequent writes based on original dimensions overflow the buffer.

Evidence

Exploitation scenario: An attacker provides a crafted image with dimensions designed to cause integer overflow.

Scanner confirmation: multi_agent_ai rule V-002 flagged this pattern.

Production code: This file is in the production codebase, not test-only code.

Changes

• scrape/magic_kernel_sharp.c

Behavior Preservation

The change is scoped to 1 file on the vulnerable path.

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Automated security fix by OrbisAI Security