diff options
| author | Neil Horman <nhorman@tuxdriver.com> | 2012-02-03 05:18:43 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-04 21:30:24 (GMT) |
| commit | 5962b35c1de3254a2f03b95efd3b7854b874d7b7 (patch) | |
| tree | f085176f6441a32782294dccdd52336c58b0ba5f /net | |
| parent | 1715322f3e0600b664fa8b780a07de104f49c104 (diff) | |
| download | linux-5962b35c1de3254a2f03b95efd3b7854b874d7b7.tar.xz | |
netprio_cgroup: Fix obo in get_prioidx
It was recently pointed out to me that the get_prioidx function sets a bit in
the prioidx map prior to checking to see if the index being set is out of
bounds. This patch corrects that, avoiding the possiblity of us writing beyond
the end of the array
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Reported-by: Stanislaw Gruszka <sgruszka@redhat.com>
CC: Stanislaw Gruszka <sgruszka@redhat.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/netprio_cgroup.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c index 3a9fd48..9ae183a 100644 --- a/net/core/netprio_cgroup.c +++ b/net/core/netprio_cgroup.c @@ -58,11 +58,12 @@ static int get_prioidx(u32 *prio) spin_lock_irqsave(&prioidx_map_lock, flags); prioidx = find_first_zero_bit(prioidx_map, sizeof(unsigned long) * PRIOIDX_SZ); + if (prioidx == sizeof(unsigned long) * PRIOIDX_SZ) { + spin_unlock_irqrestore(&prioidx_map_lock, flags); + return -ENOSPC; + } set_bit(prioidx, prioidx_map); spin_unlock_irqrestore(&prioidx_map_lock, flags); - if (prioidx == sizeof(unsigned long) * PRIOIDX_SZ) - return -ENOSPC; - atomic_set(&max_prioidx, prioidx); *prio = prioidx; return 0; |