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Date: Thu, 5 Jul 2012 16:31:42 +0800 From: Gao feng <gaofeng@...fujitsu.com> To: davem@...emloft.net Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, nhorman@...driver.com, tj@...nel.org, lizefan@...wei.com, Gao feng <gaofeng@...fujitsu.com> Subject: [PATCH] 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@...fujitsu.com> --- 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 5b8aa2f..586f7d9 100644 --- a/net/core/netprio_cgroup.c +++ b/net/core/netprio_cgroup.c @@ -50,7 +50,8 @@ static int get_prioidx(u32 *prio) } set_bit(prioidx, prioidx_map); spin_unlock_irqrestore(&prioidx_map_lock, flags); - atomic_set(&max_prioidx, prioidx); + if (atomic_read(&max_prioidx) < prioidx) + atomic_set(&max_prioidx, prioidx); *prio = prioidx; return 0; } -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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