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kernel: always initialize task->pf_io_worker to NULL

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Otherwise io_wq_worker_{running,sleeping}() may dereference an
invalid pointer (in future). Currently all users of create_io_thread()
are fine and get task->pf_io_worker = NULL implicitly from the
wq_manager, which got it either from the userspace thread
of the sq_thread, which explicitly reset it to NULL.

I think it's safer to always reset it in order to avoid future
problems.

Fixes: 3bfe610669 ("io-wq: fork worker threads from original task")
cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Metzmacher 2021-04-25 01:26:03 +02:00 committed by Jens Axboe
parent 2b4ae19c6d
commit ff24430330
1 changed files with 1 additions and 0 deletions
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kernel/fork.c
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@ -927,6 +927,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
tsk->splice_pipe = NULL;
tsk->task_frag.page = NULL;
tsk->wake_q.next = NULL;
tsk->pf_io_worker = NULL;
account_kernel_stack(tsk, 1);