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From: Young Xiao <>
Cc: Young Xiao <>
Subject: [PATCH] nfc: Ensure presence of required attributes in the deactivate_target handler
Date: Fri, 14 Jun 2019 15:13:02 +0800
Message-ID: <> (raw)

Check that the NFC_ATTR_TARGET_INDEX 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: Young Xiao <>
 net/nfc/netlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 04a8e47..89d885d 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -923,7 +923,8 @@ static int nfc_genl_deactivate_target(struct sk_buff *skb,
 	u32 device_idx, target_idx;
 	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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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-14  7:13 Young Xiao [this message]
2019-06-14 15:48 ` David Miller

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