linux-kernel - [PATCH 4.4 30/38] net: ieee802154: fix nl802154 add llsec key

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Date:   Thu, 15 Apr 2021 16:47:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+ce4e062c2d51977ddc50@...kaller.appspotmail.com,
        Alexander Aring <aahringo@...hat.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>
Subject: [PATCH 4.4 30/38] net: ieee802154: fix nl802154 add llsec key

From: Alexander Aring <aahringo@...hat.com>

commit 20d5fe2d7103f5c43ad11a3d6d259e9d61165c35 upstream.

This patch fixes a nullpointer dereference if NL802154_ATTR_SEC_KEY is
not set by the user. If this is the case nl802154 will return -EINVAL.

Reported-by: syzbot+ce4e062c2d51977ddc50@...kaller.appspotmail.com
Signed-off-by: Alexander Aring <aahringo@...hat.com>
Link: https://lore.kernel.org/r/20210221174321.14210-3-aahringo@redhat.com
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ieee802154/nl802154.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1527,7 +1527,8 @@ static int nl802154_add_llsec_key(struct
 	struct ieee802154_llsec_key_id id = { };
 	u32 commands[NL802154_CMD_FRAME_NR_IDS / 32] = { };
 
-	if (nla_parse_nested(attrs, NL802154_KEY_ATTR_MAX,
+	if (!info->attrs[NL802154_ATTR_SEC_KEY] ||
+	    nla_parse_nested(attrs, NL802154_KEY_ATTR_MAX,
 			     info->attrs[NL802154_ATTR_SEC_KEY],
 			     nl802154_key_policy))
 		return -EINVAL;