[deft-security] Fix CWE-416: Use After Free in src/cache.c

[539hex]

Security Fixes

File: src/cache.c
Highest Severity: HIGH
Fixes Applied: 1

CWE-416: Use After Free

• Severity: HIGH
• Confidence: 95%
• After freeing the hash table in free_cache(), the global pointer memory_cache isn't set to NULL. If another thread calls add_to_cache() after free_cache(), it would reinitialize memory_cache with a new hash table. However, if the freed hash table's memory is reallocated elsewhere, accessing the old pointer could lead to use-after-free. The lack of NULL assignment leaves a dangling pointer risk.

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