| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.12 30/84] cfg80211: Check if PMKID attribute is of expected size | Date | Wed, 19 Jul 2017 11:43:36 +0200 |
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4.12-stable review patch. If anyone has any objections, please let me know.
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From: Srinivas Dasari <dasaris@qti.qualcomm.com>
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>
--- net/wireless/nl80211.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -291,8 +291,7 @@ static const struct nla_policy nl80211_p [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 },
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