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authorLin Yi2019-03-20 19:04:56 +0800
committerJohan Hovold2019-03-20 13:58:42 +0100
commit2908b076f5198d231de62713cb2b633a3a4b95ac (patch)
treea4b033d46b7951c04eafd98b4ebe2caa3a37b406 /drivers/usb
parentf8df5c2c3e2df5ffaf9fb5503da93d477a8c7db4 (diff)
USB: serial: mos7720: fix mos_parport refcount imbalance on error path
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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/mos7720.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index fc52ac75fbf6..18110225d506 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -366,8 +366,6 @@ static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
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);
@@ -388,6 +386,8 @@ static int write_parport_reg_nonblock(struct mos7715_parport *mos_parport,
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);