Commit 2d280bc8 authored Nov 29, 2020 by Pavel Begunkov Committed by Jens Axboe Nov 30, 2020

io_uring: fix recvmsg setup with compat buf-select



__io_compat_recvmsg_copy_hdr() with REQ_F_BUFFER_SELECT reads out iov
len but never assigns it to iov/fast_iov, leaving sr->len with garbage.
Hopefully, following io_buffer_select() truncates it to the selected
buffer size, but the value is still may be under what was specified.

Cc: <stable@vger.kernel.org> # 5.7
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent af604703

fs/io_uring.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -4499,7 +4499,8 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
		return -EFAULT;
		if (clen < 0)
		return -EINVAL;
		sr->len = iomsg->iov[0].iov_len;
		sr->len = clen;
		iomsg->iov[0].iov_len = clen;
		iomsg->iov = NULL;
		} else {
		ret = __import_iovec(READ, (struct iovec __user *)uiov, len,

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