io_uring/net: use proper value for msg_inq

struct msghdr->msg_inq is a signed type, yet we attempt to store what
is essentially an unsigned bitmask in there. We only really need to know
if the field was stored or not, but let's use the proper type to avoid
any misunderstandings on what is being attempted here.

Link: https://lore.kernel.org/io-uring/CAHk-=wjKb24aSe6fE4zDH-eh8hr-FB9BbukObUVSMGOrsBHCRQ@mail.gmail.com/
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

io_uring/net.c

@@ -630,7 +630,7 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
 	unsigned int cflags;
 
 	cflags = io_put_kbuf(req, issue_flags);
-	if (msg->msg_inq && msg->msg_inq != -1U)
+	if (msg->msg_inq && msg->msg_inq != -1)
 		cflags |= IORING_CQE_F_SOCK_NONEMPTY;
 
 	if (!(req->flags & REQ_F_APOLL_MULTISHOT)) {
@@ -645,7 +645,7 @@ static inline bool io_recv_finish(struct io_kiocb *req, int *ret,
 			io_recv_prep_retry(req);
 			/* Known not-empty or unknown state, retry */
 			if (cflags & IORING_CQE_F_SOCK_NONEMPTY ||
-			    msg->msg_inq == -1U)
+			    msg->msg_inq == -1)
 				return false;
 			if (issue_flags & IO_URING_F_MULTISHOT)
 				*ret = IOU_ISSUE_SKIP_COMPLETE;
@@ -804,7 +804,7 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 		flags |= MSG_DONTWAIT;
 
 	kmsg->msg.msg_get_inq = 1;
-	kmsg->msg.msg_inq = -1U;
+	kmsg->msg.msg_inq = -1;
 	if (req->flags & REQ_F_APOLL_MULTISHOT) {
 		ret = io_recvmsg_multishot(sock, sr, kmsg, flags,
 					   &mshot_finished);
@@ -902,7 +902,7 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 	if (unlikely(ret))
 		goto out_free;
 
-	msg.msg_inq = -1U;
+	msg.msg_inq = -1;
 	msg.msg_flags = 0;
 
 	flags = sr->msg_flags;