net: fddi: fix UAF in fza_probe

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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/fddi/defza.c b/drivers/net/fddi/defza.c
index 060712c666bf432f0570a98532a655984144e9b1..83e4c5192f35f83d62afe9dcd241d448b8a3709b 100644 (file)
--- 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;
 }