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: 67fbb16be6 ("nl80211: PMKSA caching support")
Cc: stable@vger.kernel.org
Bug: 36818836
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>
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211.git
Git-commit: 9361df14d1cbf966409d5d6f48bb334384fbe138
Change-Id: I5feb729a9ef48f67c4ee460e7e133d5fc8cecd4f
CRs-Fixed: 2061676
Signed-off-by: Srinivas Dasari <dasaris@codeaurora.org>
b90d634e33