Add default deleter for copy assign operator in SSHPublicKey

src/Access/SSH/SSHPublicKey.cpp

@@ -45,7 +45,8 @@ SSHPublicKey & SSHPublicKey::operator=(const SSHPublicKey & other)
         {
             throw DB::Exception(DB::ErrorCodes::SSH_EXCEPTION, "Failed to duplicate ssh_key");
         }
-        key.reset(new_key);
+        key = UniqueKeyPtr(new_key, deleter); // We don't have access to the pointer from external code, opposed to non owning key object.
+                                              // So here we always go for default deleter, regardless of other's
     }
     return *this;
 }

src/Access/SSH/SSHPublicKey.h

@@ -61,7 +61,8 @@ private:
     // We may want to not own ssh_key memory, so then we pass this deleter to unique_ptr
     static void disabledDeleter(KeyPtr) { }
 
-    std::unique_ptr<ssh_key_struct, decltype(&deleter)> key;
+    using UniqueKeyPtr = std::unique_ptr<ssh_key_struct, decltype(&deleter)>;
+    UniqueKeyPtr key;
 };
 
 }