* [PATCH] net: caif: fix memory leak in ldisc_open
@ 2021-06-12 14:51 Pavel Skripkin
2021-06-14 19:30 ` patchwork-bot+netdevbpf
0 siblings, 1 reply; 2+ messages in thread
From: Pavel Skripkin @ 2021-06-12 14:51 UTC (permalink / raw)
To: davem, kuba, gregkh
Cc: netdev, linux-kernel, Pavel Skripkin, syzbot+f303e045423e617d2cad
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>
---
drivers/net/caif/caif_serial.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
index d17482395a4d..4ffbfd534f18 100644
--- a/drivers/net/caif/caif_serial.c
+++ b/drivers/net/caif/caif_serial.c
@@ -350,6 +350,7 @@ 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;
--
2.32.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] net: caif: fix memory leak in ldisc_open
2021-06-12 14:51 [PATCH] net: caif: fix memory leak in ldisc_open Pavel Skripkin
@ 2021-06-14 19:30 ` patchwork-bot+netdevbpf
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-06-14 19:30 UTC (permalink / raw)
To: Pavel Skripkin
Cc: davem, kuba, gregkh, netdev, linux-kernel, syzbot+f303e045423e617d2cad
Hello:
This patch was applied to netdev/net.git (refs/heads/master):
On Sat, 12 Jun 2021 17:51:22 +0300 you wrote:
> 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;
> }
> ...
> }
>
> [...]
Here is the summary with links:
- net: caif: fix memory leak in ldisc_open
https://git.kernel.org/netdev/net/c/58af3d3d54e8
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-06-12 14:51 [PATCH] net: caif: fix memory leak in ldisc_open Pavel Skripkin
2021-06-14 19:30 ` patchwork-bot+netdevbpf
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