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io_uring/msg_ring: reuse ctx->submitter_task read using READ_ONCE instead of re-reading it

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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>
This commit is contained in:
linke li 2024-04-26 11:24:37 +08:00 committed by Jens Axboe
parent 039a2e800b
commit a4d416dc60
1 changed files with 1 additions and 1 deletions
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2
io_uring/msg_ring.c
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@ -83,7 +83,7 @@ static int io_msg_exec_remote(struct io_kiocb *req, task_work_func_t func)
return -EOWNERDEAD;
init_task_work(&msg->tw, func);
if (task_work_add(ctx->submitter_task, &msg->tw, TWA_SIGNAL))
if (task_work_add(task, &msg->tw, TWA_SIGNAL))
return -EOWNERDEAD;
return IOU_ISSUE_SKIP_COMPLETE;