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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Pavel Begunkov <asml.silence@gmail.com>,
        Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.1 55/98] io_uring: Fix __io_uring_register() false success
Date:   Thu, 20 Jun 2019 19:57:22 +0200
Message-Id: <20190620174351.820212114@linuxfoundation.org>
In-Reply-To: <20190620174349.443386789@linuxfoundation.org>
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[ Upstream commit a278682dad37fd2f8d2f30d8e84e376a856ab472 ]

If io_copy_iov() fails, it will break the loop and report success,
albeit partially completed operation.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 4e32a033394c..e82adbf8adc1 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2506,7 +2506,7 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
 
 		ret = io_copy_iov(ctx, &iov, arg, i);
 		if (ret)
-			break;
+			goto err;
 
 		/*
 		 * Don't impose further limits on the size and buffer
-- 
2.20.1