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net: caif: fix memory leak in ldisc_open 

[ Upstream commit 58af3d3d54e87bfc1f936e16c04ade3369d34011 ]

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>
This commit is contained in:
Pavel Skripkin 2021-06-12 17:51:22 +03:00 committed by Sasha Levin
parent 8707ce86e9
commit 343406f9c1
1 changed files with 1 additions and 0 deletions
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1
drivers/net/caif/caif_serial.c
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@ -351,6 +351,7 @@ static int ldisc_open(struct tty_struct *tty)
rtnl_lock();
result = register_netdevice(dev);
if (result) {
tty_kref_put(tty);
rtnl_unlock();
free_netdev(dev);
return -ENODEV;