diff options
| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-04-15 11:31:50 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-14 08:57:21 +0300 |
| commit | 2668caa9c5c35294caa07f5c5b4ff7ff2ec2175c (patch) | |
| tree | e0397f866fad9a8b62dae5a19ab8ef92e4a2c7a4 /net | |
| parent | ba47355d79e18ba796ef01135eb53dd0b48ee320 (diff) | |
| download | linux-2668caa9c5c35294caa07f5c5b4ff7ff2ec2175c.tar.xz | |
batman-adv: Fix refcnt leak in batadv_show_throughput_override
commit f872de8185acf1b48b954ba5bd8f9bc0a0d14016 upstream.
batadv_show_throughput_override() invokes batadv_hardif_get_by_netdev(),
which gets a batadv_hard_iface object from net_dev with increased refcnt
and its reference is assigned to a local pointer 'hard_iface'.
When batadv_show_throughput_override() returns, "hard_iface" becomes
invalid, so the refcount should be decreased to keep refcount balanced.
The issue happens in the normal path of
batadv_show_throughput_override(), which forgets to decrease the refcnt
increased by batadv_hardif_get_by_netdev() before the function returns,
causing a refcnt leak.
Fix this issue by calling batadv_hardif_put() before the
batadv_show_throughput_override() returns in the normal path.
Fixes: 0b5ecc6811bd ("batman-adv: add throughput override attribute to hard_ifaces")
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/batman-adv/sysfs.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c index 09427fc6494a..7f7de0b16aa7 100644 --- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -1126,6 +1126,7 @@ static ssize_t batadv_show_throughput_override(struct kobject *kobj, tp_override = atomic_read(&hard_iface->bat_v.throughput_override); + batadv_hardif_put(hard_iface); return sprintf(buff, "%u.%u MBit\n", tp_override / 10, tp_override % 10); } |