[Xen-devel] [PATCHv2 2/3] xen-netback: unref frags when handling a from-guest skb with a frag list

[David Vrabel <david.vrabel@xxxxxxxxxx>]

Every time a VIF is destroyed up to 256 pages may be leaked if packets
with more than MAX_SKB_FRAGS frags were transmitted from the guest.
Even worse, if another user of ballooned pages allocated one of these
ballooned pages it would not handle the unexpectedly >1 page count
(e.g., gntdev would deadlock when unmapping a grant because the page
count would never reach 1).

When handling a from-guest skb with a frag list, unref the frags
before releasing them so they are freed correctly when the VIF is
destroyed.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 drivers/net/xen-netback/netback.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/xen-netback/netback.c 
b/drivers/net/xen-netback/netback.c
index f7a31d2..f5560cd 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1343,7 +1343,7 @@ static int xenvif_handle_frag_list(struct xenvif_queue 
*queue, struct sk_buff *s
 {
        unsigned int offset = skb_headlen(skb);
        skb_frag_t frags[MAX_SKB_FRAGS];
-       int i;
+       int i, f;
        struct ubuf_info *uarg;
        struct sk_buff *nskb = skb_shinfo(skb)->frag_list;
 
@@ -1383,6 +1383,11 @@ static int xenvif_handle_frag_list(struct xenvif_queue 
*queue, struct sk_buff *s
                frags[i].page_offset = 0;
                skb_frag_size_set(&frags[i], len);
        }
+
+       /* Release all the original (foreign) frags. */
+       for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
+               skb_frag_unref(skb, f);
+
        /* swap out with old one */
        memcpy(skb_shinfo(skb)->frags,
               frags,
-- 
1.7.10.4


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