nfc: netlink: Add check on NFC_ATTR_VENDOR_DATA
NFC_ATTR_VENDOR_DATA is an optional vendor_cmd argument.
The current code was potentially using a non existing argument
leading to potential catastrophic results.
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index f85f37e..81dfaaa 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1518,8 +1518,8 @@
if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
return -ENODEV;
- data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
- if (data) {
+ if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
+ data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
if (data_len == 0)
return -EINVAL;