fix: add integer overflow check in dxt_encoder.c

[orbisai0security]

Summary

Fix critical severity security issue in dxt_compress/dxt_encoder.c.

Vulnerability

Field	Value
ID	V-003
Severity	CRITICAL
Scanner	multi_agent_ai
Rule	V-003
File	dxt_compress/dxt_encoder.c:679
Assessment	Confirmed exploitable
CWE	CWE-190

Description: The memcpy at line 679 copies compressed data into image_compressed using a complex size calculation with alignment rounding. The allocation at line 453 may use a different formula, creating a size mismatch. The arithmetic expression ((width+3)/44)((height+3)/4*4) is susceptible to integer overflow with large width/height values, potentially resulting in a small computed size that wraps around.

Changes

• dxt_compress/dxt_encoder.c

Verification

• Build passes
• Scanner re-scan confirms fix
• LLM code review passed

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Automated security fix by OrbisAI Security