From: Andrey Konovalov <andreyknvl@google.com>
Date: Mon, 29 Jul 2019 13:35:01 +0000 (+0300)
Subject: NFC: fix attrs checks in netlink interface
X-Git-Tag: v4.19.78~3
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8a65ec0602a78a05c9f33d8dc68d7eafef77f2b;p=thirdparty%2Fkernel%2Fstable.git

NFC: fix attrs checks in netlink interface

commit 18917d51472fe3b126a3a8f756c6b18085eb8130 upstream.

nfc_genl_deactivate_target() relies on the NFC_ATTR_TARGET_INDEX
attribute being present, but doesn't check whether it is actually
provided by the user. Same goes for nfc_genl_fw_download() and
NFC_ATTR_FIRMWARE_NAME.

This patch adds appropriate checks.

Found with syzkaller.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 9f2875efb4ac9..b3662264aa24c 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -981,7 +981,8 @@ static int nfc_genl_dep_link_down(struct sk_buff *skb, struct genl_info *info)
 	int rc;
 	u32 idx;
 
-	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+	    !info->attrs[NFC_ATTR_TARGET_INDEX])
 		return -EINVAL;
 
 	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
@@ -1029,7 +1030,8 @@ static int nfc_genl_llc_get_params(struct sk_buff *skb, struct genl_info *info)
 	struct sk_buff *msg = NULL;
 	u32 idx;
 
-	if (!info->attrs[NFC_ATTR_DEVICE_INDEX])
+	if (!info->attrs[NFC_ATTR_DEVICE_INDEX] ||
+	    !info->attrs[NFC_ATTR_FIRMWARE_NAME])
 		return -EINVAL;
 
 	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);