Merge tag 'io_uring-6.4-2023-06-21' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:
 "A fix for a race condition with poll removal and linked timeouts, and
  then a few followup fixes/tweaks for the msg_control patch from last
  week.

  Not super important, particularly the sparse fixup, as it was broken
  before that recent commit. But let's get it sorted for real for this
  release, rather than just have it broken a bit differently"

* tag 'io_uring-6.4-2023-06-21' of git://git.kernel.dk/linux:
  io_uring/net: use the correct msghdr union member in io_sendmsg_copy_hdr
  io_uring/net: disable partial retries for recvmsg with cmsg
  io_uring/net: clear msg_controllen on partial sendmsg retry
  io_uring/poll: serialize poll linked timer start with poll removal

Author: torvalds

io_uring/net.c

@@ -203,7 +203,7 @@ static int io_sendmsg_copy_hdr(struct io_kiocb *req,
 	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;
+	sr->msg_control = iomsg->msg.msg_control_user;
 	return ret;
 }
 
@@ -302,7 +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;
+		kmsg->msg.msg_control_user = sr->msg_control;
 	} else {
 		ret = io_sendmsg_copy_hdr(req, &iomsg);
 		if (ret)
@@ -326,6 +326,8 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 		if (ret == -EAGAIN && (issue_flags & IO_URING_F_NONBLOCK))
 			return io_setup_async_msg(req, kmsg, issue_flags);
 		if (ret > 0 && io_net_retry(sock, flags)) {
+			kmsg->msg.msg_controllen = 0;
+			kmsg->msg.msg_control = NULL;
 			sr->done_io += ret;
 			req->flags |= REQ_F_PARTIAL_IO;
 			return io_setup_async_msg(req, kmsg, issue_flags);
@@ -787,16 +789,19 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 	flags = sr->msg_flags;
 	if (force_nonblock)
 		flags |= MSG_DONTWAIT;
-	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
 
 	kmsg->msg.msg_get_inq = 1;
-	if (req->flags & REQ_F_APOLL_MULTISHOT)
+	if (req->flags & REQ_F_APOLL_MULTISHOT) {
 		ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
 					   &mshot_finished);
-	else
+	} else {
+		/* disable partial retry for recvmsg with cmsg attached */
+		if (flags & MSG_WAITALL && !kmsg->msg.msg_controllen)
+			min_ret = iov_iter_count(&kmsg->msg.msg_iter);
+
 		ret = __sys_recvmsg_sock(sock, &kmsg->msg, sr->umsg,
 					 kmsg->uaddr, flags);
+	}
 
 	if (ret < min_ret) {
 		if (ret == -EAGAIN && force_nonblock) {

io_uring/poll.c

@@ -977,8 +977,9 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
 	struct io_hash_bucket *bucket;
 	struct io_kiocb *preq;
 	int ret2, ret = 0;
-	struct io_tw_state ts = {};
+	struct io_tw_state ts = { .locked = true };
 
+	io_ring_submit_lock(ctx, issue_flags);
 	preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket);
 	ret2 = io_poll_disarm(preq);
 	if (bucket)
@@ -990,12 +991,10 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
 		goto out;
 	}
 
-	io_ring_submit_lock(ctx, issue_flags);
 	preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table_locked, &bucket);
 	ret2 = io_poll_disarm(preq);
 	if (bucket)
 		spin_unlock(&bucket->lock);
-	io_ring_submit_unlock(ctx, issue_flags);
 	if (ret2) {
 		ret = ret2;
 		goto out;
@@ -1019,17 +1018,17 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
 		if (poll_update->update_user_data)
 			preq->cqe.user_data = poll_update->new_user_data;
 
-		ret2 = io_poll_add(preq, issue_flags);
+		ret2 = io_poll_add(preq, issue_flags & ~IO_URING_F_UNLOCKED);
 		/* successfully updated, don't complete poll request */
 		if (!ret2 || ret2 == -EIOCBQUEUED)
 			goto out;
 	}
 
 	req_set_fail(preq);
 	io_req_set_res(preq, -ECANCELED, 0);
-	ts.locked = !(issue_flags & IO_URING_F_UNLOCKED);
 	io_req_task_complete(preq, &ts);
 out:
+	io_ring_submit_unlock(ctx, issue_flags);
 	if (ret < 0) {
 		req_set_fail(req);
 		return ret;