diff options
| author | Xin Xiong <xiongx18@fudan.edu.cn> | 2020-07-29 16:06:59 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-07-31 03:35:53 +0300 |
| commit | 51875dad43b44241b46a569493f1e4bfa0386d86 (patch) | |
| tree | 31e2041f798d1a07bc34de829316aac83526cc41 | |
| parent | 555a893303872e044fb86f0a5834ce78d41ad2e2 (diff) | |
| download | linux-51875dad43b44241b46a569493f1e4bfa0386d86.tar.xz | |
atm: fix atm_dev refcnt leaks in atmtcp_remove_persistent
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>
| -rw-r--r-- | drivers/atm/atmtcp.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/atm/atmtcp.c b/drivers/atm/atmtcp.c index d9fd70280482..7f814da3c2d0 100644 --- a/drivers/atm/atmtcp.c +++ b/drivers/atm/atmtcp.c @@ -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); |