From: Pavel Skripkin <paskripkin@gmail.com>
To: alex.aring@gmail.com, stefan@datenfreihafen.org, davem@davemloft.net
Cc: linux-wpan@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
Pavel Skripkin <paskripkin@gmail.com>,
syzbot+ac5c11d2959a8b3c4806@syzkaller.appspotmail.com
Subject: [PATCH] net: fix NULL ptr dereference in nl802154_del_llsec_key
Date: Sat, 3 Apr 2021 18:18:51 +0300 [thread overview]
Message-ID: <20210403151851.9437-1-paskripkin@gmail.com> (raw)
syzbot reported NULL ptr dereference in nl802154_del_llsec_key()[1]
The problem was in case of info->attrs[NL802154_ATTR_SEC_KEY] == NULL.
nla_parse_nested_deprecated()[2] doesn't check this condition before calling
nla_len()[3]
Call Trace:
nla_len include/net/netlink.h:1148 [inline] [3]
nla_parse_nested_deprecated include/net/netlink.h:1231 [inline] [2]
nl802154_del_llsec_key+0x16d/0x320 net/ieee802154/nl802154.c:1595 [1]
genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
Reported-by: syzbot+ac5c11d2959a8b3c4806@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
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 7c5a1aa5adb4..2f0a138bd5eb 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1592,7 +1592,8 @@ static int nl802154_del_llsec_key(struct sk_buff *skb, struct genl_info *info)
struct nlattr *attrs[NL802154_KEY_ATTR_MAX + 1];
struct ieee802154_llsec_key_id id;
- if (nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack))
+ if (!info->attrs[NL802154_ATTR_SEC_KEY] ||
+ nla_parse_nested_deprecated(attrs, NL802154_KEY_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_KEY], nl802154_key_policy, info->extack))
return -EINVAL;
if (ieee802154_llsec_parse_key_id(attrs[NL802154_KEY_ATTR_ID], &id) < 0)
--
2.30.2
next reply other threads:[~2021-04-03 15:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-03 15:18 Pavel Skripkin [this message]
2021-04-05 0:37 ` [PATCH] net: fix NULL ptr dereference in nl802154_del_llsec_key Alexander Aring
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