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In the error path of build_tree(), node instances can remain in the local
linked list when the function returns.
Whenever an invalid value is detected in the self ID sequence, each
allocated node instance is either an entry in the linked list or an
entry in the ports array of its parent node. Therefore, the allocate
node instances can be safely released by traversing the linked list from
its head.
Release the remaining node instances with for_each_fw_node() before
returning to the caller.
Fixes: 3038e353cfaf ("firewire: Add core firewire stack.")
Reported-by: Abdun Nihaal <nihaal@cse.iitm.ac.in>
Link: https://lore.kernel.org/all/20260727095955.104972-1-nihaal@cse.iitm.ac.in/
Link: https://lore.kernel.org/r/20260811120928.700577-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
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Abdun Nihaal has reported a memory leak when tree building fails in the
middle of self ID sequence enumeration. This is caused by an invalid
self ID sequence and is not a common occurrence.
This commit is intended to assist in fixing the issue by adding KUnit
tests to show the cases in which the memory leak is triggered. The leak
occurs internally in the build_tree() function, therefore it cannot be
detected directly by the tests.
Link: https://lore.kernel.org/r/20260810064119.410324-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
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After a bus reset, self ID sequence is captured by 1394 OHCI hardware and
passed to software through SelfID DMA context. The core parses the sequence
to build an internal cache of the node tree for the current generation
of the bus. This is the first step in managing resources on the bus.
The tree is build by the build_tree() function. This commit adds KUnit
tests for the function, covering several successful scenarios.
Link: https://lore.kernel.org/r/20260810064119.410324-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
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Some issues have been reported in node tree management. Refactoring
the topology-related code in the core is required. Adding unit tests
would help ensure that the refactoring does not introduce regressions.
This commit adds a KUnit test skeleton for this purpose.
Link: https://lore.kernel.org/r/20260810064119.410324-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
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