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net: caif: fix memory leak in ldisc_open
[ Upstream commit 58af3d3d54
]
Syzbot reported memory leak in tty_init_dev().
The problem was in unputted tty in ldisc_open()
static int ldisc_open(struct tty_struct *tty)
{
...
ser->tty = tty_kref_get(tty);
...
result = register_netdevice(dev);
if (result) {
rtnl_unlock();
free_netdev(dev);
return -ENODEV;
}
...
}
Ser pointer is netdev private_data, so after free_netdev()
this pointer goes away with unputted tty reference. So, fix
it by adding tty_kref_put() before freeing netdev.
Reported-and-tested-by: syzbot+f303e045423e617d2cad@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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parent
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1 changed files with 1 additions and 0 deletions
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@ -351,6 +351,7 @@ static int ldisc_open(struct tty_struct *tty)
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rtnl_lock();
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result = register_netdevice(dev);
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if (result) {
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tty_kref_put(tty);
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rtnl_unlock();
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free_netdev(dev);
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return -ENODEV;
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