diff options
| author | Haiyang Zhang <haiyangz@microsoft.com> | 2012-02-02 07:18:00 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-02 14:35:12 -0500 |
| commit | c31c151b1c4a29da4dc92212aa8648fb4f8557b9 (patch) | |
| tree | c61eb4b25fcac9f70cc381468b2365d85ca39ad6 /drivers/net/hyperv/netvsc_drv.c | |
| parent | 0a282538cc1977655004cdb2eb25dd2b63f20637 (diff) | |
net/hyperv: Fix the page buffer when an RNDIS message goes beyond page boundary
There is a possible data corruption if an RNDIS message goes beyond page
boundary in the sending code path. This patch fixes the problem.
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hyperv/netvsc_drv.c')
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 69193fcb7648..466c58a7353d 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -151,10 +151,10 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) int ret; unsigned int i, num_pages, npg_data; - /* Add multipage for skb->data and additional one for RNDIS */ + /* Add multipages for skb->data and additional 2 for RNDIS */ npg_data = (((unsigned long)skb->data + skb_headlen(skb) - 1) >> PAGE_SHIFT) - ((unsigned long)skb->data >> PAGE_SHIFT) + 1; - num_pages = skb_shinfo(skb)->nr_frags + npg_data + 1; + num_pages = skb_shinfo(skb)->nr_frags + npg_data + 2; /* Allocate a netvsc packet based on # of frags. */ packet = kzalloc(sizeof(struct hv_netvsc_packet) + @@ -173,8 +173,8 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) sizeof(struct hv_netvsc_packet) + (num_pages * sizeof(struct hv_page_buffer)); - /* Setup the rndis header */ - packet->page_buf_cnt = num_pages; + /* If the rndis msg goes beyond 1 page, we will add 1 later */ + packet->page_buf_cnt = num_pages - 1; /* Initialize it from the skb */ packet->total_data_buflen = skb->len; |