path: root/net/nfc
diff options
authorMateusz Jurczyk <mjurczyk@google.com>2017-05-24 12:42:26 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2017-06-23 00:28:39 +0200
commita0323b979f81ad2deb2c8836eab506534891876a (patch)
treecc7570d4c5ad589540743a5ffdb0a26c701862da /net/nfc
parentnfc: Fix the sockaddr length sanitization in llcp_sock_connect (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>
Diffstat (limited to 'net/nfc')
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]);