linux-kernel - [PATCH] netfilter: nfnetlink: check 'skb->dev' pointer in nfulnl_log

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Date:   Fri,  2 Dec 2022 16:33:04 +0800
From:   Li Qiong <liqiong@...china.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        coreteam@...filter.org, Yu Zhe <yuzhe@...china.com>,
        Li Qiong <liqiong@...china.com>
Subject: [PATCH] netfilter: nfnetlink: check 'skb->dev' pointer in nfulnl_log_packet()

The 'skb->dev' may be NULL, it should be better to check it.

Signed-off-by: Li Qiong <liqiong@...china.com>
---
 net/netfilter/nfnetlink_log.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/netfilter/nfnetlink_log.c b/net/netfilter/nfnetlink_log.c
index d97eb280cb2e..74ac9fa40137 100644
--- a/net/netfilter/nfnetlink_log.c
+++ b/net/netfilter/nfnetlink_log.c
@@ -572,7 +572,7 @@ __build_packet_message(struct nfnl_log_net *log,
 		}
 	}
 
-	if (indev && skb_mac_header_was_set(skb)) {
+	if (indev && skb->dev && skb_mac_header_was_set(skb)) {
 		if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
 		    nla_put_be16(inst->skb, NFULA_HWLEN,
 				 htons(skb->dev->hard_header_len)))
@@ -724,7 +724,7 @@ nfulnl_log_packet(struct net *net,
 		+ nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp))
 		+ nla_total_size(sizeof(struct nfgenmsg));	/* NLMSG_DONE */
 
-	if (in && skb_mac_header_was_set(skb)) {
+	if (in && skb->dev && skb_mac_header_was_set(skb)) {
 		size += nla_total_size(skb->dev->hard_header_len)
 			+ nla_total_size(sizeof(u_int16_t))	/* hwtype */
 			+ nla_total_size(sizeof(u_int16_t));	/* hwlen */
-- 
2.11.0