Hi @Jiri Kosina, Does this patch work for you? Is there anything else you'd like me to change for the patch? Thank you, Ping On Wed, Dec 9, 2020 at 8:52 PM Ping Cheng <pinglinux@xxxxxxxxx> wrote: > > As reported by syzbot below, kfifo_alloc'd memory would not be freed > if a non-zero return value is triggered in wacom_probe. This patch > creates and uses devm_kfifo_alloc to allocate and free itself. > > BUG: memory leak > unreferenced object 0xffff88810dc44a00 (size 512): > comm "kworker/1:2", pid 3674, jiffies 4294943617 (age 14.100s) > hex dump (first 32 bytes): > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [<0000000023e1afac>] kmalloc_array include/linux/slab.h:592 [inline] > [<0000000023e1afac>] __kfifo_alloc+0xad/0x100 lib/kfifo.c:43 > [<00000000c477f737>] wacom_probe+0x1a1/0x3b0 drivers/hid/wacom_sys.c:2727 > [<00000000b3109aca>] hid_device_probe+0x16b/0x210 drivers/hid/hid-core.c:2281 > [<00000000aff7c640>] really_probe+0x159/0x480 drivers/base/dd.c:554 > [<00000000778d0bc3>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738 > [<000000005108dbb5>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844 > [<00000000efb7c59e>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:431 > [<0000000024ab1590>] __device_attach+0x122/0x250 drivers/base/dd.c:912 > [<000000004c7ac048>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:491 > [<00000000b93050a3>] device_add+0x5ac/0xc30 drivers/base/core.c:2936 > [<00000000e5b46ea5>] hid_add_device+0x151/0x390 drivers/hid/hid-core.c:2437 > [<00000000c6add147>] usbhid_probe+0x412/0x560 drivers/hid/usbhid/hid-core.c:1407 > [<00000000c33acdb4>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396 > [<00000000aff7c640>] really_probe+0x159/0x480 drivers/base/dd.c:554 > [<00000000778d0bc3>] driver_probe_device+0x84/0x100 drivers/base/dd.c:738 > [<000000005108dbb5>] __device_attach_driver+0xee/0x110 drivers/base/dd.c:844 > > https://syzkaller.appspot.com/bug?extid=5b49c9695968d7250a26 > > Reported-by: syzbot+5b49c9695968d7250a26@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Ping Cheng <ping.cheng@xxxxxxxxx> > Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx> > --- > drivers/hid/wacom_sys.c | 35 ++++++++++++++++++++++++++++++++--- > 1 file changed, 32 insertions(+), 3 deletions(-) > > diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c > index cd71e7133944..9e852b4bbf92 100644 > --- a/drivers/hid/wacom_sys.c > +++ b/drivers/hid/wacom_sys.c > @@ -1270,6 +1270,37 @@ static int wacom_devm_sysfs_create_group(struct wacom *wacom, > group); > } > > +static void wacom_devm_kfifo_release(struct device *dev, void *res) > +{ > + struct kfifo_rec_ptr_2 *devres = res; > + > + kfifo_free(devres); > +} > + > +static int wacom_devm_kfifo_alloc(struct wacom *wacom) > +{ > + struct wacom_wac *wacom_wac = &wacom->wacom_wac; > + struct kfifo_rec_ptr_2 *pen_fifo = &wacom_wac->pen_fifo; > + int error; > + > + pen_fifo = devres_alloc(wacom_devm_kfifo_release, > + sizeof(struct kfifo_rec_ptr_2), > + GFP_KERNEL); > + > + if (!pen_fifo) > + return -ENOMEM; > + > + error = kfifo_alloc(pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL); > + if (error) { > + devres_free(pen_fifo); > + return error; > + } > + > + devres_add(&wacom->hdev->dev, pen_fifo); > + > + return 0; > +} > + > enum led_brightness wacom_leds_brightness_get(struct wacom_led *led) > { > struct wacom *wacom = led->wacom; > @@ -2724,7 +2755,7 @@ static int wacom_probe(struct hid_device *hdev, > if (features->check_for_hid_type && features->hid_type != hdev->type) > return -ENODEV; > > - error = kfifo_alloc(&wacom_wac->pen_fifo, WACOM_PKGLEN_MAX, GFP_KERNEL); > + error = wacom_devm_kfifo_alloc(wacom); > if (error) > return error; > > @@ -2786,8 +2817,6 @@ static void wacom_remove(struct hid_device *hdev) > > if (wacom->wacom_wac.features.type != REMOTE) > wacom_release_resources(wacom); > - > - kfifo_free(&wacom_wac->pen_fifo); > } > > #ifdef CONFIG_PM > -- > 2.17.1 >
