From: Srinivas Dasari <dasaris@xxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Srinivas Dasari <dasaris@xxxxxxxxxxxxxxxx>
Signed-off-by: Jouni Malinen <jouni@xxxxxxxxxxxxxxxx>
---
net/wireless/nl80211.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 364291c..dcfeae0 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 },
--
2.7.4
