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io_uring-6.4-2023-06-15

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Merge tag 'io_uring-6.4-2023-06-15' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:
 "A fix for sendmsg with CMSG, and the followup fix discussed for
  avoiding touching task->worker_private after the worker has started
  exiting"

* tag 'io_uring-6.4-2023-06-15' of git://git.kernel.dk/linux:
  io_uring/io-wq: clear current->worker_private on exit
  io_uring/net: save msghdr->msg_control for retries
This commit is contained in:
Linus Torvalds 2023-06-16 12:27:20 -07:00
commit 3a12faba95
2 changed files with 13 additions and 2 deletions
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7
io_uring/io-wq.c
View file

@ -220,7 +220,12 @@ static void io_worker_exit(struct io_worker *worker)
list_del_rcu(&worker->all_list);
raw_spin_unlock(&wq->lock);
io_wq_dec_running(worker);
worker->flags = 0;
/*
* this worker is a goner, clear ->worker_private to avoid any
* inc/dec running calls that could happen as part of exit from
* touching 'worker'.
*/
current->worker_private = NULL;
kfree_rcu(worker, rcu);
io_worker_ref_put(wq);

8
io_uring/net.c
View file

@ -65,6 +65,7 @@ struct io_sr_msg {
u16 addr_len;
u16 buf_group;
void __user *addr;
void __user *msg_control;
/* used only for send zerocopy */
struct io_kiocb *notif;
};
@ -195,11 +196,15 @@ static int io_sendmsg_copy_hdr(struct io_kiocb *req,
struct io_async_msghdr *iomsg)
{
struct io_sr_msg *sr = io_kiocb_to_cmd(req, struct io_sr_msg);
int ret;
iomsg->msg.msg_name = &iomsg->addr;
iomsg->free_iov = iomsg->fast_iov;
return sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags,
ret = sendmsg_copy_msghdr(&iomsg->msg, sr->umsg, sr->msg_flags,
&iomsg->free_iov);
/* save msg_control as sys_sendmsg() overwrites it */
sr->msg_control = iomsg->msg.msg_control;
return ret;
}
int io_send_prep_async(struct io_kiocb *req)
@ -297,6 +302,7 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
if (req_has_async_data(req)) {
kmsg = req->async_data;
kmsg->msg.msg_control = sr->msg_control;
} else {
ret = io_sendmsg_copy_hdr(req, &iomsg);
if (ret)