Re: [PATCH wpan 2/4] net: ieee802154: fix nl802154 del llsec dev

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Hello.

On 21.02.21 18:43, Alexander Aring wrote:
This patch fixes a nullpointer dereference if NL802154_ATTR_SEC_DEVICE is
not set by the user. If this is the case nl802154 will return -EINVAL.

Reported-by: syzbot+d946223c2e751d136c94@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alexander Aring <aahringo@xxxxxxxxxx>
---
  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 2f0a138bd5eb..063b12cba71f 100644
--- a/net/ieee802154/nl802154.c
+++ b/net/ieee802154/nl802154.c
@@ -1758,7 +1758,8 @@ static int nl802154_del_llsec_dev(struct sk_buff *skb, struct genl_info *info)
  	struct nlattr *attrs[NL802154_DEV_ATTR_MAX + 1];
  	__le64 extended_addr;
- if (nla_parse_nested_deprecated(attrs, NL802154_DEV_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_DEVICE], nl802154_dev_policy, info->extack))
+	if (!info->attrs[NL802154_ATTR_SEC_DEVICE] ||
+	    nla_parse_nested_deprecated(attrs, NL802154_DEV_ATTR_MAX, info->attrs[NL802154_ATTR_SEC_DEVICE], nl802154_dev_policy, info->extack))
  		return -EINVAL;
if (!attrs[NL802154_DEV_ATTR_EXTENDED_ADDR])



This patch has been applied to the wpan tree and will be
part of the next pull request to net. Thanks!

regards
Stefan Schmidt



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