From: Tao Chen Date: Sat, 5 Nov 2022 09:05:04 +0000 (+0800) Subject: netlink: Fix potential skb memleak in netlink_ack X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e69761483361f3df455bc493c99af0ef1744a14f;p=linux.git netlink: Fix potential skb memleak in netlink_ack Fix coverity issue 'Resource leak'. We should clean the skb resource if nlmsg_put/append failed. Fixes: 738136a0e375 ("netlink: split up copies in the ack construction") Signed-off-by: Tao Chen Link: https://lore.kernel.org/r/bff442d62c87de6299817fe1897cc5a5694ba9cc.1667638204.git.chentao.kernel@linux.alibaba.com Signed-off-by: Jakub Kicinski --- diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index b10d5e50b99d8..9ebdf3262015c 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -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); }