diff options
| author | Hiroaki SHIMODA <shimoda.hiroaki@gmail.com> | 2012-08-03 19:57:52 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-02 09:47:05 -0700 |
| commit | d5916dedd20a1714a8436f51ba4df13bd4c56474 (patch) | |
| tree | 9b90289de4dc3b03bfc018609b93e491c84faaa8 /net/sched/act_gact.c | |
| parent | 09c403dc7c8e73a4f9c553e4d84aef68af25ff65 (diff) | |
net_sched: gact: Fix potential panic in tcf_gact().
[ Upstream commit 696ecdc10622d86541f2e35cc16e15b6b3b1b67e ]
gact_rand array is accessed by gact->tcfg_ptype whose value
is assumed to less than MAX_RAND, but any range checks are
not performed.
So add a check in tcf_gact_init(). And in tcf_gact(), we can
reduce a branch.
Signed-off-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/sched/act_gact.c')
| -rw-r--r-- | net/sched/act_gact.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c index 2b4ab4b05ce..89ddcb5fe0e 100644 --- a/net/sched/act_gact.c +++ b/net/sched/act_gact.c @@ -67,6 +67,9 @@ static int tcf_gact_init(struct nlattr *nla, struct nlattr *est, struct tcf_common *pc; int ret = 0; int err; +#ifdef CONFIG_GACT_PROB + struct tc_gact_p *p_parm = NULL; +#endif if (nla == NULL) return -EINVAL; @@ -82,6 +85,12 @@ static int tcf_gact_init(struct nlattr *nla, struct nlattr *est, #ifndef CONFIG_GACT_PROB if (tb[TCA_GACT_PROB] != NULL) return -EOPNOTSUPP; +#else + if (tb[TCA_GACT_PROB]) { + p_parm = nla_data(tb[TCA_GACT_PROB]); + if (p_parm->ptype >= MAX_RAND) + return -EINVAL; + } #endif pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info); @@ -103,8 +112,7 @@ static int tcf_gact_init(struct nlattr *nla, struct nlattr *est, spin_lock_bh(&gact->tcf_lock); gact->tcf_action = parm->action; #ifdef CONFIG_GACT_PROB - if (tb[TCA_GACT_PROB] != NULL) { - struct tc_gact_p *p_parm = nla_data(tb[TCA_GACT_PROB]); + if (p_parm) { gact->tcfg_paction = p_parm->paction; gact->tcfg_pval = p_parm->pval; gact->tcfg_ptype = p_parm->ptype; @@ -132,7 +140,7 @@ static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result spin_lock(&gact->tcf_lock); #ifdef CONFIG_GACT_PROB - if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL) + if (gact->tcfg_ptype) action = gact_rand[gact->tcfg_ptype](gact); else action = gact->tcf_action; |