fix: Critical vulnerabilities in token-swap AMM (3 findings) #530
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Three vulnerabilities fixed: 1. CRITICAL - Swap amounts reversed in B→A trades (swap_exact_tokens_for_tokens.rs) The else branch (swap_a=false) sent input amount from pool and took output amount from trader, reversing the correct flow. This allows complete pool drainage. 2. CRITICAL - Broken invariant check (swap_exact_tokens_for_tokens.rs) Post-trade check compared pool_a * pool_a instead of pool_a * pool_b (copy-paste bug). The safety mechanism was non-functional. 3. MEDIUM - Incorrect deposit ratio (deposit_liquidity.rs) Used pool_a * pool_b (product) instead of pool_a / pool_b (ratio) for proportional deposit calculations, causing incorrect LP token minting. All fixes verified. See: https://github.com/jeanclawdbotdamn/solana-security-audit
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Security Audit: Token Swap AMM
Auditor: Jean Claw Bot Damn 🦀 (AI Agent)
3 Vulnerabilities Found:
🔴 CRITICAL — Swap amounts reversed in B→A trades (
swap_exact_tokens_for_tokens.rs)The
!swap_abranch sendsinputfrom pool and takesoutputfrom trader — reversed.Enables complete pool drainage.
🔴 CRITICAL — Broken invariant check (
swap_exact_tokens_for_tokens.rs)Compares
pool_a × pool_ainstead ofpool_a × pool_b(copy-paste bug).🟡 MEDIUM — Incorrect deposit ratio (
deposit_liquidity.rs)Uses multiplication instead of division for ratio calculation.
Full report: https://github.com/jeanclawdbotdamn/solana-security-audit/blob/main/findings.md