From 2c08522e5d2f0af2d6f05be558946dcbf8173683 Mon Sep 17 00:00:00 2001 From: Tim Gardner Date: Tue, 23 Feb 2010 14:55:21 +0100 Subject: [PATCH] netfilter: xt_recent: fix buffer overflow e->index overflows e->stamps[] every ip_pkt_list_tot packets. Consider the case when ip_pkt_list_tot==1; the first packet received is stored in e->stamps[0] and e->index is initialized to 1. The next received packet timestamp is then stored at e->stamps[1] in recent_entry_update(), a buffer overflow because the maximum e->stamps[] index is 0. Signed-off-by: Tim Gardner Cc: stable@kernel.org Signed-off-by: Patrick McHardy --- net/netfilter/xt_recent.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index 132cfaa84cdc..1278f0aa7434 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -177,10 +177,10 @@ recent_entry_init(struct recent_table *t, const union nf_inet_addr *addr, static void recent_entry_update(struct recent_table *t, struct recent_entry *e) { + e->index %= ip_pkt_list_tot; e->stamps[e->index++] = jiffies; if (e->index > e->nstamps) e->nstamps = e->index; - e->index %= ip_pkt_list_tot; list_move_tail(&e->lru_list, &t->lru_list); } -- 2.20.1