diff options
| author | Mateusz Jurczyk <mjurczyk@google.com> | 2017-05-24 12:42:26 +0200 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2017-06-23 00:28:39 +0200 |
| commit | a0323b979f81ad2deb2c8836eab506534891876a (patch) | |
| tree | cc7570d4c5ad589540743a5ffdb0a26c701862da | |
| parent | 608c4adfcabab220142ee335a2a003ccd1c0b25b (diff) | |
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: Mateusz Jurczyk <mjurczyk@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
| -rw-r--r-- | net/nfc/netlink.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c index 6b0850e63e09..b251fb936a27 100644 --- a/net/nfc/netlink.c +++ b/net/nfc/netlink.c @@ -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] || + !info->attrs[NFC_ATTR_PROTOCOLS]) return -EINVAL; device_idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]); |