Merge tag 'io_uring-5.8-2020-07-17' of git://git.kernel.dk/linux-bloc…

…k into master

Pull io_uring fix from Jens Axboe:
 "Fix for a case where, with automatic buffer selection, we can leak the
  buffer descriptor for recvmsg"

* tag 'io_uring-5.8-2020-07-17' of git://git.kernel.dk/linux-block:
  io_uring: fix recvmsg memory leak with buffer selection

fs/io_uring.c

@@ -3845,10 +3845,16 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock)
 
 		ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.msg,
 						kmsg->uaddr, flags);
-		if (force_nonblock && ret == -EAGAIN)
-			return io_setup_async_msg(req, kmsg);
+		if (force_nonblock && ret == -EAGAIN) {
+			ret = io_setup_async_msg(req, kmsg);
+			if (ret != -EAGAIN)
+				kfree(kbuf);
+			return ret;
+		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
+		if (kbuf)
+			kfree(kbuf);
 	}
 
 	if (kmsg && kmsg->iov != kmsg->fast_iov)