From: Xiyu Yang xiyuyang19@fudan.edu.cn
commit 6107c5da0fca8b50b4d3215e94d619d38cc4a18c 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_store_throughput_override() returns, "hard_iface" becomes invalid, so the refcount should be decreased to keep refcount balanced.
The issue happens in one error path of batadv_store_throughput_override(). When batadv_parse_throughput() returns NULL, the refcnt increased by batadv_hardif_get_by_netdev() is not decreased, causing a refcnt leak.
Fix this issue by jumping to "out" label when batadv_parse_throughput() returns NULL.
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
--- net/batman-adv/sysfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/batman-adv/sysfs.c +++ b/net/batman-adv/sysfs.c @@ -1087,7 +1087,7 @@ static ssize_t batadv_store_throughput_o ret = batadv_parse_throughput(net_dev, buff, "throughput_override", &tp_override); if (!ret) - return count; + goto out;
old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override); if (old_tp_override == tp_override)