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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>
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@ -1518,8 +1518,8 @@ static int nfc_genl_vendor_cmd(struct sk_buff *skb,
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if (!dev || !dev->vendor_cmds || !dev->n_vendor_cmds)
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return -ENODEV;
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data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
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if (data) {
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if (info->attrs[NFC_ATTR_VENDOR_DATA]) {
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data = nla_data(info->attrs[NFC_ATTR_VENDOR_DATA]);
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data_len = nla_len(info->attrs[NFC_ATTR_VENDOR_DATA]);
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if (data_len == 0)
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return -EINVAL;
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