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authorJozsef Kadlecsik <kadlec@blackhole.kfki.hu>2012-05-07 02:35:44 +0000
committerPablo Neira Ayuso <pablo@netfilter.org>2012-05-17 00:56:41 +0200
commit127f559127f5175e4bec3dab725a34845d956591 (patch)
tree1fe965b02a8c54835caca7e88b0d8e28f9286127 /net
parent1a4ac9870fb82eed56623d0f69ec59aa5bef85fe (diff)
downloadlinux-127f559127f5175e4bec3dab725a34845d956591.tar.gz
netfilter: ipset: fix timeout value overflow bug
Large timeout parameters could result wrong timeout values due to an overflow at msec to jiffies conversion (reported by Andreas Herz) [ This patch was mangled by Pablo Neira Ayuso since David Laight and Eric Dumazet noticed that we were using hardcoded 1000 instead of MSEC_PER_SEC to calculate the timeout ] Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/xt_set.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/net/netfilter/xt_set.c b/net/netfilter/xt_set.c
index 0ec8138aa47..035960ec5cb 100644
--- a/net/netfilter/xt_set.c
+++ b/net/netfilter/xt_set.c
@@ -44,6 +44,14 @@ const struct ip_set_adt_opt n = { \
.cmdflags = cfs, \
.timeout = t, \
}
+#define ADT_MOPT(n, f, d, fs, cfs, t) \
+struct ip_set_adt_opt n = { \
+ .family = f, \
+ .dim = d, \
+ .flags = fs, \
+ .cmdflags = cfs, \
+ .timeout = t, \
+}
/* Revision 0 interface: backward compatible with netfilter/iptables */
@@ -296,11 +304,14 @@ static unsigned int
set_target_v2(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_set_info_target_v2 *info = par->targinfo;
- ADT_OPT(add_opt, par->family, info->add_set.dim,
- info->add_set.flags, info->flags, info->timeout);
+ ADT_MOPT(add_opt, par->family, info->add_set.dim,
+ info->add_set.flags, info->flags, info->timeout);
ADT_OPT(del_opt, par->family, info->del_set.dim,
info->del_set.flags, 0, UINT_MAX);
+ /* Normalize to fit into jiffies */
+ if (add_opt.timeout > UINT_MAX/MSEC_PER_SEC)
+ add_opt.timeout = UINT_MAX/MSEC_PER_SEC;
if (info->add_set.index != IPSET_INVALID_ID)
ip_set_add(info->add_set.index, skb, par, &add_opt);
if (info->del_set.index != IPSET_INVALID_ID)