Commit a0323b97 authored by Mateusz Jurczyk's avatar Mateusz Jurczyk Committed by Samuel Ortiz

nfc: Ensure presence of required attributes in the activate_target handler

Check that the NFC_ATTR_TARGET_INDEX and NFC_ATTR_PROTOCOLS attributes (in
addition to NFC_ATTR_DEVICE_INDEX) are provided by the netlink client
prior to accessing them. This prevents potential unhandled NULL pointer
dereference exceptions which can be triggered by malicious user-mode
programs, if they omit one or both of these attributes.
Signed-off-by: default avatarMateusz Jurczyk <>
Acked-by: default avatarKees Cook <>
Signed-off-by: default avatarSamuel Ortiz <>
parent 608c4adf
......@@ -907,7 +907,9 @@ static int nfc_genl_activate_target(struct sk_buff *skb, struct genl_info *info)
u32 device_idx, target_idx, protocol;
int rc;
if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
!info->attrs[NFC_ATTR_TARGET_INDEX] ||
return -EINVAL;
device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
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