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hyperv: Fix page buffer handling in rndis_filter_send_request()
To prevent possible data corruption in RNDIS requests, add another page buffer if the request message crossed page boundary. Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -45,7 +45,8 @@ struct rndis_request {
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/* Simplify allocation by having a netvsc packet inline */
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struct hv_netvsc_packet pkt;
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struct hv_page_buffer buf;
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/* Set 2 pages for rndis requests crossing page boundary */
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struct hv_page_buffer buf[2];
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struct rndis_message request_msg;
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/*
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@ -227,6 +228,18 @@ static int rndis_filter_send_request(struct rndis_device *dev,
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packet->page_buf[0].offset =
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(unsigned long)&req->request_msg & (PAGE_SIZE - 1);
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/* Add one page_buf when request_msg crossing page boundary */
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if (packet->page_buf[0].offset + packet->page_buf[0].len > PAGE_SIZE) {
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packet->page_buf_cnt++;
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packet->page_buf[0].len = PAGE_SIZE -
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packet->page_buf[0].offset;
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packet->page_buf[1].pfn = virt_to_phys((void *)&req->request_msg
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+ packet->page_buf[0].len) >> PAGE_SHIFT;
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packet->page_buf[1].offset = 0;
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packet->page_buf[1].len = req->request_msg.msg_len -
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packet->page_buf[0].len;
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}
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packet->completion.send.send_completion_ctx = req;/* packet; */
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packet->completion.send.send_completion =
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rndis_filter_send_request_completion;
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