Fix memory management in Index.getInfo

src/Index.zig

@@ -513,15 +513,26 @@ pub fn getInfo(self: *Self, allocator: std.mem.Allocator) !IndexInfo {
     defer self.releaseSegments(&snapshot); // FIXME this possibly deletes orphaned segments, do it in a separate thread
 
     var attributes: std.StringHashMapUnmanaged(u64) = .{};
-    errdefer attributes.deinit(allocator);
+    errdefer {
+        var iter = attributes.iterator();
+        while (iter.next()) |e| {
+            allocator.free(e.key_ptr.*);
+        }
+        attributes.deinit(allocator);
+    }
 
     var version: u64 = 0;
     inline for (segment_lists) |n| {
         const segments = @field(snapshot, n);
         for (segments.value.nodes.items) |node| {
             var iter = node.value.attributes.iterator();
             while (iter.next()) |entry| {
-                try attributes.put(allocator, entry.key_ptr.*, entry.value_ptr.*);
+                const result = try attributes.getOrPut(allocator, entry.key_ptr.*);
+                if (!result.found_existing) {
+                    errdefer attributes.removeByPtr(entry.key_ptr);
+                    result.key_ptr.* = try allocator.dupe(u8, entry.key_ptr.*);
+                }
+                result.value_ptr.* = entry.value_ptr.*;
             }
             std.debug.assert(node.value.info.version > version);
             version = node.value.info.version;