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authorSrinivas Dasari <dasaris@qti.qualcomm.com>2017-07-07 01:43:40 +0300
committerJohannes Berg <johannes.berg@intel.com>2017-07-07 12:22:21 +0300
commit0a27844ce86d039d74221dd56cd8c0349b146b63 (patch)
tree8ed068b10a4d3bdd751e335265173e76a123ba56
parent9361df14d1cbf966409d5d6f48bb334384fbe138 (diff)
downloadlinux-0a27844ce86d039d74221dd56cd8c0349b146b63.tar.xz
cfg80211: Check if NAN service ID is of expected size
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, cfg80211 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_NAN_FUNC_SERVICE_ID to make these NLA_UNSPEC and to make sure minimum NL80211_NAN_FUNC_SERVICE_ID_LEN bytes are received from userspace with NL80211_NAN_FUNC_SERVICE_ID. Fixes: a442b761b24 ("cfg80211: add add_nan_func / del_nan_func") 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>
-rw-r--r--net/wireless/nl80211.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 53ab5cae70c8..a2c93bfb9668 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -519,7 +519,7 @@ nl80211_bss_select_policy[NL80211_BSS_SELECT_ATTR_MAX + 1] = {
static const struct nla_policy
nl80211_nan_func_policy[NL80211_NAN_FUNC_ATTR_MAX + 1] = {
[NL80211_NAN_FUNC_TYPE] = { .type = NLA_U8 },
- [NL80211_NAN_FUNC_SERVICE_ID] = { .type = NLA_BINARY,
+ [NL80211_NAN_FUNC_SERVICE_ID] = {
.len = NL80211_NAN_FUNC_SERVICE_ID_LEN },
[NL80211_NAN_FUNC_PUBLISH_TYPE] = { .type = NLA_U8 },
[NL80211_NAN_FUNC_PUBLISH_BCAST] = { .type = NLA_FLAG },