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netlink: Fix potential skb memleak in netlink_ack

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Fix coverity issue 'Resource leak'.

We should clean the skb resource if nlmsg_put/append failed.

Fixes: 738136a0e3 ("netlink: split up copies in the ack construction")
Signed-off-by: Tao Chen <chentao.kernel@linux.alibaba.com>
Link: https://lore.kernel.org/r/bff442d62c87de6299817fe1897cc5a5694ba9cc.1667638204.git.chentao.kernel@linux.alibaba.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tao Chen 2022-11-05 17:05:04 +08:00 committed by Jakub Kicinski
parent 14ef5c3989
commit e697614833
1 changed files with 3 additions and 1 deletions
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4
net/netlink/af_netlink.c
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@ -2500,7 +2500,7 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
skb = nlmsg_new(payload + tlvlen, GFP_KERNEL);
if (!skb)
goto err_bad_put;
goto err_skb;
rep = nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
NLMSG_ERROR, sizeof(*errmsg), flags);
@ -2528,6 +2528,8 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
return;
err_bad_put:
nlmsg_free(skb);
err_skb:
NETLINK_CB(in_skb).sk->sk_err = ENOBUFS;
sk_error_report(NETLINK_CB(in_skb).sk);
}