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| author |  linke li <lilinke99@qq.com>
| 2024-04-26 11:24:37 +0800 |
|---|---|---|
| committer |  Jens Axboe <axboe@kernel.dk>
| 2024-04-26 07:40:12 -0600 |
| commit | a4d416dc60980f741f0bfa1f34a1059c498c1b4e (patch) | |
| tree | 442b8419c20264d41a16b4be300c477a2c4e567e /io_uring/msg_ring.c | |
| parent | io_uring/rw: reinstate thread check for retries (diff) | |
| download | linux-a4d416dc60980f741f0bfa1f34a1059c498c1b4e.tar.gz linux-a4d416dc60980f741f0bfa1f34a1059c498c1b4e.tar.bz2 linux-a4d416dc60980f741f0bfa1f34a1059c498c1b4e.zip | |
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>
Diffstat (limited to 'io_uring/msg_ring.c')
| -rw-r--r-- | io_uring/msg_ring.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/io_uring/msg_ring.c b/io_uring/msg_ring.c index cd6dcf634ba3..d74670b39ed6 100644 --- a/io_uring/msg_ring.c +++ b/io_uring/msg_ring.c @@ -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; |