We currently use hdr_len as a hint of head length which is advertised by
guest. But when guest advertise a very big value, it can lead to an 64K+
allocating of kmalloc() which has a very high possibility of failure when host
memory is fragmented or under heavy stress. The huge hdr_len also reduce the
effect of zerocopy or even disable if a gso skb is linearized in guest.
To solves those issues, this patch introduces an upper limit (PAGE_SIZE) of the
head, which guarantees an order 0 allocation each time.
Cc: Stefan Hajnoczi <stefa...@redhat.com>
Cc: Michael S. Tsirkin <m...@redhat.com>
Signed-off-by: Jason Wang <jasow...@redhat.com>
---
The patch was needed for stable.
---
drivers/net/macvtap.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 9dccb1e..7ee6f9d 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -523,6 +523,11 @@ static inline struct sk_buff *macvtap_alloc_skb(struct
sock *sk, size_t prepad,
int noblock, int *err)
{
struct sk_buff *skb;
+ int good_linear = SKB_MAX_HEAD(prepad);
+
+ /* Don't use huge linear part */
+ if (linear > good_linear)
+ linear = good_linear;
/* Under a page? Don't bother with paged skb. */
if (prepad + len < PAGE_SIZE || !linear)
--
1.8.3.2
--
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