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net: fddi: fix UAF in fza_probe

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commit deb7178eb9 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: 61414f5ec9 ("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>
This commit is contained in:
Pavel Skripkin 2021-07-13 13:58:53 +03:00 committed by Greg Kroah-Hartman
parent 8aa13a8696
commit 04b0671683
1 changed files with 1 additions and 2 deletions
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3
drivers/net/fddi/defza.c
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@ -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;
}