linux-kernel - [PATCH] net: fddi: fix UAF in fza

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Message-Id: <20210713105853.8979-1-paskripkin@gmail.com>
Date:   Tue, 13 Jul 2021 13:58:53 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     macro@...am.me.uk, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pavel Skripkin <paskripkin@...il.com>
Subject: [PATCH] net: fddi: fix UAF in fza_probe

fp is netdev private data and it cannot be
used after free_netdev() call. Using fp after free_netdev()
can cause UAF bug. Fix it by moving free_netdev() after error message.

Fixes: 61414f5ec983 ("FDDI: defza: Add support for DEC FDDIcontroller 700
TURBOchannel adapter")
Signed-off-by: Pavel Skripkin <paskripkin@...il.com>
---
 drivers/net/fddi/defza.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/fddi/defza.c b/drivers/net/fddi/defza.c
index 14f07050b6b1..0de2c4552f5e 100644
--- a/drivers/net/fddi/defza.c
+++ b/drivers/net/fddi/defza.c
@@ -1504,9 +1504,8 @@ static int fza_probe(struct device *bdev)
 	release_mem_region(start, len);
 
 err_out_kfree:
-	free_netdev(dev);
-
 	pr_err("%s: initialization failure, aborting!\n", fp->name);
+	free_netdev(dev);
 	return ret;
 }
 
-- 
2.32.0