4.9-stable review patch. If anyone has any objections, please let me know.
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From: Lin Yi teroincn@163.com
commit 2908b076f5198d231de62713cb2b633a3a4b95ac upstream.
The write_parport_reg_nonblock() helper takes a reference to the struct mos_parport, but failed to release it in a couple of error paths after allocation failures, leading to a memory leak.
Johan said that move the kref_get() and mos_parport assignment to the end of urbtrack initialisation is a better way, so move it. and mos_parport do not used until urbtrack initialisation.
Signed-off-by: Lin Yi teroincn@163.com Fixes: b69578df7e98 ("USB: usbserial: mos7720: add support for parallel port on moschip 7715") Cc: stable stable@vger.kernel.org # 2.6.35 Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/serial/mos7720.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/usb/serial/mos7720.c +++ b/drivers/usb/serial/mos7720.c @@ -368,8 +368,6 @@ static int write_parport_reg_nonblock(st if (!urbtrack) return -ENOMEM;
- kref_get(&mos_parport->ref_count); - urbtrack->mos_parport = mos_parport; urbtrack->urb = usb_alloc_urb(0, GFP_ATOMIC); if (!urbtrack->urb) { kfree(urbtrack); @@ -390,6 +388,8 @@ static int write_parport_reg_nonblock(st usb_sndctrlpipe(usbdev, 0), (unsigned char *)urbtrack->setup, NULL, 0, async_complete, urbtrack); + kref_get(&mos_parport->ref_count); + urbtrack->mos_parport = mos_parport; kref_init(&urbtrack->ref_count); INIT_LIST_HEAD(&urbtrack->urblist_entry);