Hi! > From: Xiyu Yang <xiyuyang19@xxxxxxxxxxxx> > > 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. Ok, this fixes the issue, but it brings up a question: > --- a/net/batman-adv/sysfs.c > +++ b/net/batman-adv/sysfs.c > @@ -1093,7 +1093,7 @@ static ssize_t batadv_store_throughput_o > ret = batadv_parse_throughput(net_dev, buff, "throughput_override", > &tp_override); > if (!ret) > - return count; > + goto out; > If parsing of value from userspace failed we are currently returning success. That seems wrong. Should we return -EINVAL instead? Best regards, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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