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[OpenWrt-Devel] iwinfo: Fix incorrect buffer allocation in nl80211_get_ifcomb_cb()

Message ID 1418305665-1537-1-git-send-email-bugs@andrewmcdonnell.net
State Accepted
Headers show

Commit Message

Andrew McDonnell Dec. 11, 2014, 1:47 p.m. UTC 
This fixes a buffer overwrite, I found it when building with SSP enabled

---

 iwinfo_nl80211.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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Patch

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;