staging: hv: fix the page buffer when rndis data go across page boundary
In rndis_filter_receive_data(), we need to drop the 0th page and move the
rest of pages forward if the rndis data go across page boundary, otherwise
the page offset will overflow.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/hv/rndis_filter.c b/drivers/staging/hv/rndis_filter.c
index 20e673d..b325345 100644
--- a/drivers/staging/hv/rndis_filter.c
+++ b/drivers/staging/hv/rndis_filter.c
@@ -323,6 +323,7 @@
{
struct rndis_packet *rndis_pkt;
u32 data_offset;
+ int i;
rndis_pkt = &msg->msg.pkt;
@@ -338,6 +339,15 @@
pkt->page_buf[0].offset += data_offset;
pkt->page_buf[0].len -= data_offset;
+ /* Drop the 0th page, if rndis data go beyond page boundary */
+ if (pkt->page_buf[0].offset >= PAGE_SIZE) {
+ pkt->page_buf[1].offset = pkt->page_buf[0].offset - PAGE_SIZE;
+ pkt->page_buf[1].len -= pkt->page_buf[1].offset;
+ pkt->page_buf_cnt--;
+ for (i = 0; i < pkt->page_buf_cnt; i++)
+ pkt->page_buf[i] = pkt->page_buf[i+1];
+ }
+
pkt->is_data_pkt = true;
netvsc_recv_callback(dev->net_dev->dev, pkt);