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authorSrinivas Dasari <dasaris@qti.qualcomm.com>2017-07-07 01:43:39 +0300
committerSasha Levin <alexander.levin@verizon.com>2017-07-31 13:37:54 -0400
commit371d2b7115822448a16e2dc83463cf9da5a4e1f0 (patch)
tree8d60307988714e69ed09b4bfed7bfffe339ed0fe /net
parent7189535967e9928349200f1922ca8e82e309eb6f (diff)
cfg80211: Check if PMKID attribute is of expected size
[ Upstream commit 9361df14d1cbf966409d5d6f48bb334384fbe138 ] 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") Cc: stable@vger.kernel.org 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: Sasha Levin <alexander.levin@verizon.com>
Diffstat (limited to 'net')
-rw-r--r--net/wireless/nl80211.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index c3f6c770aa0d..e81e20cbe6dd 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -301,8 +301,7 @@ 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 },