diff options
| author | Jason Wang <[email protected]> | 2013-11-13 14:00:39 +0800 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2013-11-14 16:05:27 -0500 |
| commit | 96f8d9ecf227638c89f98ccdcdd50b569891976c (patch) | |
| tree | 8c6c163cd3914426873843c0fdb1c850dd5fe053 /net/lapb/lapb_timer.c | |
| parent | 6115c11fe1a5a636ac99fc823b00df4ff3c0674e (diff) | |
tuntap: limit head length of skb allocated
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 <[email protected]>
Cc: Michael S. Tsirkin <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'net/lapb/lapb_timer.c')
0 files changed, 0 insertions, 0 deletions