netdev - [PATCH net] ethtool: pse-pd: fix null-deref on genl

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Date:   Wed, 19 Oct 2022 15:35:51 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, edumazet@...gle.com, pabeni@...hat.com,
        Jakub Kicinski <kuba@...nel.org>,
        syzbot+81c4b4bbba6eea2cfcae@...kaller.appspotmail.com,
        andrew@...n.ch, linux@...pel-privat.de, bagasdotme@...il.com,
        lkp@...el.com
Subject: [PATCH net] ethtool: pse-pd: fix null-deref on genl_info in dump

ethnl_default_dump_one() passes NULL as info.

It's correct not to set extack during dump, as we should just
silently skip interfaces which can't provide the information.

Reported-by: syzbot+81c4b4bbba6eea2cfcae@...kaller.appspotmail.com
Fixes: 18ff0bcda6d1 ("ethtool: add interface to interact with Ethernet Power Equipment")
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: andrew@...n.ch
CC: linux@...pel-privat.de
CC: bagasdotme@...il.com
CC: lkp@...el.com
---
 net/ethtool/pse-pd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ethtool/pse-pd.c b/net/ethtool/pse-pd.c
index 5a471e115b66..e8683e485dc9 100644
--- a/net/ethtool/pse-pd.c
+++ b/net/ethtool/pse-pd.c
@@ -64,7 +64,7 @@ static int pse_prepare_data(const struct ethnl_req_info *req_base,
 	if (ret < 0)
 		return ret;
 
-	ret = pse_get_pse_attributes(dev, info->extack, data);
+	ret = pse_get_pse_attributes(dev, info ? info->extack : NULL, data);
 
 	ethnl_ops_complete(dev);
 
-- 
2.37.3