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