[PATCH 5.13 133/156] net: fddi: fix UAF in fza_probe

[Greg Kroah-Hartman]

From: Pavel Skripkin <paskripkin@xxxxxxxxx>

commit deb7178eb940e2c5caca1b1db084a69b2e59b4c9 upstream.

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@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/fddi/defza.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/fddi/defza.c
+++ b/drivers/net/fddi/defza.c
@@ -1504,9 +1504,8 @@ err_out_resource:
 	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;
 }