commit 37e55cf0ceb8803256bf69a3e45bd668bf90b76f
Author: Jan Engelhardt <jengelh@xxxxxxxxxx>
Date: Fri Apr 24 17:05:21 2009 +0200
netfilter: xt_recent: fix stack overread in compat code
Related-to: commit 325fb5b4d26038cba665dd0d8ee09555321061f0
The compat path suffers from a similar problem. It only uses a __be32
when all of the recent code uses, and expects, an nf_inet_addr
everywhere. As a result, addresses stored by xt_recents were
filled with whatever other stuff was on the stack following the be32.
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxx>
With a minor compile fix from Roman.
Reported-and-tested-by: Roman Hoog Antink <rha@xxxxxxx>
Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx>
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c
index 791e030..eb0ceb8 100644
--- a/net/netfilter/xt_recent.c
+++ b/net/netfilter/xt_recent.c
@@ -474,7 +474,7 @@ static ssize_t recent_old_proc_write(struct file *file,
struct recent_table *t = pde->data;
struct recent_entry *e;
char buf[sizeof("+255.255.255.255")], *c = buf;
- __be32 addr;
+ union nf_inet_addr addr = {};
int add;
if (size > sizeof(buf))
@@ -506,14 +506,13 @@ static ssize_t recent_old_proc_write(struct file *file,
add = 1;
break;
}
- addr = in_aton(c);
+ addr.ip = in_aton(c);
spin_lock_bh(&recent_lock);
- e = recent_entry_lookup(t, (const void *)&addr, NFPROTO_IPV4, 0);
+ e = recent_entry_lookup(t, &addr, NFPROTO_IPV4, 0);
if (e == NULL) {
if (add)
- recent_entry_init(t, (const void *)&addr,
- NFPROTO_IPV4, 0);
+ recent_entry_init(t, &addr, NFPROTO_IPV4, 0);
} else {
if (add)
recent_entry_update(t, e);
--
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