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atm: fix atm_dev refcnt leaks in atmtcp_remove_persistent 

[ Upstream commit 51875dad43 ]

atmtcp_remove_persistent() invokes atm_dev_lookup(), which returns a
reference of atm_dev with increased refcount or NULL if fails.

The refcount leaks issues occur in two error handling paths. If
dev_data->persist is zero or PRIV(dev)->vcc isn't NULL, the function
returns 0 without decreasing the refcount kept by a local variable,
resulting in refcount leaks.

Fix the issue by adding atm_dev_put() before returning 0 both when
dev_data->persist is zero or PRIV(dev)->vcc isn't NULL.

Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Xin Xiong 2020-07-29 21:06:59 +08:00 committed by Greg Kroah-Hartman
parent 5414f27048
commit 414f10532c
1 changed files with 8 additions and 2 deletions
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10
drivers/atm/atmtcp.c
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@ -433,9 +433,15 @@ static int atmtcp_remove_persistent(int itf)
return -EMEDIUMTYPE;
}
dev_data = PRIV(dev);
if (!dev_data->persist) return 0;
if (!dev_data->persist) {
atm_dev_put(dev);
return 0;
}
dev_data->persist = 0;
if (PRIV(dev)->vcc) return 0;
if (PRIV(dev)->vcc) {
atm_dev_put(dev);
return 0;
}
kfree(dev_data);
atm_dev_put(dev);
atm_dev_deregister(dev);