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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>
This commit is contained in:
Christophe Ricard 2015-08-14 22:33:40 +02:00 committed by Samuel Ortiz
parent 94b85938ad
commit fe202fe955
1 changed files with 2 additions and 2 deletions
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4
net/nfc/netlink.c
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@ -1518,8 +1518,8 @@ static int nfc_genl_vendor_cmd(struct sk_buff *skb,
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;