[PATCH] net/ncsi: check for null return from call to nla_nest_start

[PATCH] net/ncsi: check for null return from call to nla_nest_start

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

The call to nla_nest_start calls nla_put which can lead to a NULL
return so it's possible for attr to become NULL and we can potentially
get a NULL pointer dereference on attr.  Fix this by checking for
a NULL return.

Detected by CoverityScan, CID#1466125 ("Dereference null return")

Fixes: 955dc68cb9b2 ("net/ncsi: Add generic netlink family")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 net/ncsi/ncsi-netlink.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ncsi/ncsi-netlink.c b/net/ncsi/ncsi-netlink.c
index 05fcfb4fbe1d..8d7e849d4825 100644
--- a/net/ncsi/ncsi-netlink.c
+++ b/net/ncsi/ncsi-netlink.c
@@ -190,6 +190,10 @@ static int ncsi_pkg_info_nl(struct sk_buff *msg, struct genl_info *info)
 	package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
 
 	attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
+	if (!attr) {
+		kfree_skb(skb);
+		return -EMSGSIZE;
+	}
 	rc = ncsi_write_package_info(skb, ndp, package_id);
 
 	if (rc) {
-- 
2.15.1

Re: [PATCH] net/ncsi: check for null return from call to nla_nest_start

[David Miller]

From: Colin King <colin.king@canonical.com>
Date: Mon, 26 Mar 2018 12:27:12 +0100

> From: Colin Ian King <colin.king@canonical.com>
> 
> The call to nla_nest_start calls nla_put which can lead to a NULL
> return so it's possible for attr to become NULL and we can potentially
> get a NULL pointer dereference on attr.  Fix this by checking for
> a NULL return.
> 
> Detected by CoverityScan, CID#1466125 ("Dereference null return")
> 
> Fixes: 955dc68cb9b2 ("net/ncsi: Add generic netlink family")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Applied, but...

Colin, please start marking your Subject lines properly with "[PATCH
net-next]" for patches targetting net-next as opposed to net.

Thank you.