diff options
| author |   Gao feng <gaofeng@cn.fujitsu.com> | 2012-07-04 23:28:40 +0000 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2012-07-09 00:18:04 -0700 |
| commit | b761c9b1f4f69eb53fb6147547a1ab25237a93b3 (patch) | |
| tree | 914b20a973bbffca5fd4e524d2858ff708b56bba /net/core/netprio_cgroup.c | |
| parent | netdev/phy: Fixup lockdep warnings in mdio-mux.c (diff) | |
| download | linux-dev-b761c9b1f4f69eb53fb6147547a1ab25237a93b3.tar.xz linux-dev-b761c9b1f4f69eb53fb6147547a1ab25237a93b3.zip | |
cgroup: fix panic in netprio_cgroup
we set max_prioidx to the first zero bit index of prioidx_map in
function get_prioidx.
So when we delete the low index netprio cgroup and adding a new
netprio cgroup again,the max_prioidx will be set to the low index.
when we set the high index cgroup's net_prio.ifpriomap,the function
write_priomap will call update_netdev_tables to alloc memory which
size is sizeof(struct netprio_map) + sizeof(u32) * (max_prioidx + 1),
so the size of array that map->priomap point to is max_prioidx +1,
which is low than what we actually need.
fix this by adding check in get_prioidx,only set max_prioidx when
max_prioidx low than the new prioidx.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/netprio_cgroup.c')
| -rw-r--r-- | net/core/netprio_cgroup.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c index 5b8aa2fae48b..aa907ed466ea 100644 --- a/net/core/netprio_cgroup.c +++ b/net/core/netprio_cgroup.c @@ -49,8 +49,9 @@ static int get_prioidx(u32 *prio) return -ENOSPC; } set_bit(prioidx, prioidx_map); + if (atomic_read(&max_prioidx) < prioidx) + atomic_set(&max_prioidx, prioidx); spin_unlock_irqrestore(&prioidx_map_lock, flags); - atomic_set(&max_prioidx, prioidx); *prio = prioidx; return 0; } |