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| author | Tim Gardner <tim.gardner@canonical.com> | 2010-02-23 14:55:21 +0100 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2010-02-23 14:55:21 +0100 |
| commit | 2c08522e5d2f0af2d6f05be558946dcbf8173683 (patch) | |
| tree | b82c724797d76d29143c6b267bd006f40466f9c3 /net | |
| parent | 9e2dcf72023d1447f09c47d77c99b0c49659e5ce (diff) | |
| download | lwn-2c08522e5d2f0af2d6f05be558946dcbf8173683.tar.gz lwn-2c08522e5d2f0af2d6f05be558946dcbf8173683.zip | |
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 <tim.gardner@canonical.com>
Cc: stable@kernel.org
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/xt_recent.c | 2 |
1 files changed, 1 insertions, 1 deletions
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); } |