io_uring/msg_ring: reuse ctx->submitter_task read using READ_ONCE instead of re-reading it
In io_msg_exec_remote(), ctx->submitter_task is read using READ_ONCE at the beginning of the function, checked, and then re-read from ctx->submitter_task, voiding all guarantees of the checks. Reuse the value that was read by READ_ONCE to ensure the consistency of the task struct throughout the function. Signed-off-by: linke li <lilinke99@qq.com> Link: https://lore.kernel.org/r/tencent_F9B2296C93928D6F68FF0C95C33475C68209@qq.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -83,7 +83,7 @@ static int io_msg_exec_remote(struct io_kiocb *req, task_work_func_t func)
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return -EOWNERDEAD;
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init_task_work(&msg->tw, func);
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if (task_work_add(ctx->submitter_task, &msg->tw, TWA_SIGNAL))
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if (task_work_add(task, &msg->tw, TWA_SIGNAL))
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return -EOWNERDEAD;
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return IOU_ISSUE_SKIP_COMPLETE;
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