diff options
| author | Pavel Skripkin <paskripkin@gmail.com> | 2021-06-12 17:51:22 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2021-06-30 08:47:47 -0400 |
| commit | 343406f9c198c5f8e38720bd168c04ef666fe5d9 (patch) | |
| tree | 16b691a879cdaac05e5d48154e60fc45e95b8279 | |
| parent | 8707ce86e9277cbd03952ec860c0335c6a1a968a (diff) | |
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>
| -rw-r--r-- | drivers/net/caif/caif_serial.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c index 0f2bee59a82b..0bc7f6518fb3 100644 --- a/drivers/net/caif/caif_serial.c +++ b/drivers/net/caif/caif_serial.c @@ -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; |