Messages in this thread Patch in this message |  | | Date | Tue, 14 Apr 2015 09:36:34 +1000 | From | NeilBrown <> | Subject | [PATCH] hso: fix refcnt leak in recent patch. |
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Prior to commit 29bd3bc1194c624ce863cab2a7da9bc1f0c3b47b hso: fix crash when device disappears while serial port is open
hso_serial_open would always kref_get(&serial->parent->ref) before returning zero. Since that commit, it only calls kref_get when returning 0 if serial->port.count was zero.
This results in calls to kref_put(&serial->parent->ref, hso_serial_ref_free);
after hso_serial_ref_free has been called, which dereferences a freed pointer.
This patch adds the missing kref_get().
Fixes: commit 29bd3bc1194c624ce863cab2a7da9bc1f0c3b47b Cc: stable@vger.kernel.org (v4.0) Cc: Olivier Sobrie <olivier@sobrie.be> Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index 75befc1bd816..6848fc903340 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -1299,6 +1299,7 @@ static int hso_serial_open(struct tty_struct *tty, struct file *filp) } } else { D1("Port was already open"); + kref_get(&serial->parent->ref); } usb_autopm_put_interface(serial->parent->interface);[unhandled content-type:application/pgp-signature]
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