From: Andrew McDonnell <bugs@andrewmcdonnell.net>
Date: Thu, 11 Dec 2014 13:47:45 +0000 (+1030)
Subject: iwinfo: Fix incorrect buffer allocation in nl80211_get_ifcomb_cb()
X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fiwinfo.git;a=commitdiff_plain;h=50370d9e698696770b021caf0b5f6482bacb45ce

iwinfo: Fix incorrect buffer allocation in nl80211_get_ifcomb_cb()

This fixes a buffer overwrite, I found it when building with SSP enabled
---

diff --git a/iwinfo_nl80211.c b/iwinfo_nl80211.c
index 2731b2b..be58c56 100644
--- a/iwinfo_nl80211.c
+++ b/iwinfo_nl80211.c
@@ -2446,15 +2446,15 @@ static int nl80211_get_ifcomb_cb(struct nl_msg *msg, void *arg)
 			[NL80211_IFACE_COMB_LIMITS] = { .type = NLA_NESTED },
 			[NL80211_IFACE_COMB_MAXNUM] = { .type = NLA_U32 },
 		};
-		struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB];
+		struct nlattr *tb_comb[NUM_NL80211_IFACE_COMB+1];
 		static struct nla_policy iface_limit_policy[NUM_NL80211_IFACE_LIMIT] = {
 			[NL80211_IFACE_LIMIT_TYPES] = { .type = NLA_NESTED },
 			[NL80211_IFACE_LIMIT_MAX] = { .type = NLA_U32 },
 		};
-		struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT];
+		struct nlattr *tb_limit[NUM_NL80211_IFACE_LIMIT+1];
 		struct nlattr *limit;
 
-		nla_parse_nested(tb_comb, NL80211_BAND_ATTR_MAX, comb, iface_combination_policy);
+		nla_parse_nested(tb_comb, NUM_NL80211_IFACE_COMB, comb, iface_combination_policy);
 
 		if (!tb_comb[NL80211_IFACE_COMB_LIMITS])
 			continue;