zzstoatzz.io
prefect server in zig
fix use-after-free in retry scheduling
stack buffer for scheduled_time was escaping scope via ctx.scheduleRetry().
moved buffer to RuleContext struct to ensure lifetime.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
+2
-3
src/orchestration/flow_rules.zig
+2
-3
src/orchestration/flow_rules.zig
···
142
142
const now_us = time_util.nowMicros();
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const scheduled_us = now_us + delay_seconds * 1_000_000;
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145
-
// format as ISO timestamp using stack buffer
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-
var buf: [32]u8 = undefined;
147
-
const scheduled_time = time_util.formatMicros(&buf, scheduled_us);
145
+
// format as ISO timestamp using context's buffer (not stack buffer - avoids use-after-free)
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+
const scheduled_time = time_util.formatMicros(&ctx._retry_time_buf, scheduled_us);
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147
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ctx.scheduleRetry("Retrying", scheduled_time);
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}
+3
src/orchestration/rules.zig
+3
src/orchestration/rules.zig
···
49
49
retry_state_name: ?[]const u8 = null,
50
50
retry_scheduled_time: ?[]const u8 = null,
51
51
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+
// internal buffer for retry_scheduled_time (to avoid use-after-free from stack buffers)
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+
_retry_time_buf: [32]u8 = undefined,
54
+
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// empirical_policy mutation flags (set by RetryFailedFlows)
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// when set, API handler should update the policy JSON accordingly
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set_retry_type_in_process: bool = false, // set retry_type = "in_process"