netdev - [PATCH] net: ieee802154: fix a null pointer in nl802154_trigger

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Date:   Tue,  7 Mar 2023 15:30:03 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Dongliang Mu <dzm91@...t.edu.cn>,
        syzbot+bd85b31816913a32e473@...kaller.appspotmail.com,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net: ieee802154: fix a null pointer in nl802154_trigger_scan

There is a null pointer dereference if NL802154_ATTR_SCAN_TYPE is
not set by the user.

Fix this by adding a null pointer check.

Reported-and-tested-by: syzbot+bd85b31816913a32e473@...kaller.appspotmail.com
Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
---
 net/ieee802154/nl802154.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
index 2215f576ee37..1cf00cffd63f 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1412,7 +1412,8 @@ static int nl802154_trigger_scan(struct sk_buff *skb, struct genl_info *info)
 		return -EOPNOTSUPP;
 	}
 
-	if (!nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])) {
+	if (!info->attrs[NL802154_ATTR_SCAN_TYPE] ||
+	    !nla_get_u8(info->attrs[NL802154_ATTR_SCAN_TYPE])) {
 		NL_SET_ERR_MSG(info->extack, "Malformed request, missing scan type");
 		return -EINVAL;
 	}
-- 
2.34.1