From: Srinivas Dasari <dasaris@qti.qualcomm.com>
Date: Fri, 7 Jul 2017 01:43:39 +0300
Subject: [PATCH] cfg80211: Check if PMKID attribute is of expected size
References: bnc#1060662
Patch-mainline: 4.12.3
Git-commit: 9361df14d1cbf966409d5d6f48bb334384fbe138
commit 9361df14d1cbf966409d5d6f48bb334384fbe138 upstream.
nla policy checks for only maximum length of the attribute data
when the attribute type is NLA_BINARY. If userspace sends less
data than specified, the wireless drivers may access illegal
memory. When type is NLA_UNSPEC, nla policy check ensures that
userspace sends minimum specified length number of bytes.
Remove type assignment to NLA_BINARY from nla_policy of
NL80211_ATTR_PMKID to make this NLA_UNSPEC and to make sure minimum
WLAN_PMKID_LEN bytes are received from userspace with
NL80211_ATTR_PMKID.
Fixes: 67fbb16be69d ("nl80211: PMKSA caching support")
Signed-off-by: Srinivas Dasari <dasaris@qti.qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
net/wireless/nl80211.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index a3e4bf9c89c5..06e489ec603e 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -291,8 +291,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
[NL80211_ATTR_PID] = { .type = NLA_U32 },
[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
- [NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
- .len = WLAN_PMKID_LEN },
+ [NL80211_ATTR_PMKID] = { .len = WLAN_PMKID_LEN },
[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
--
2.14.2