[BUG] media: as102: kmemleak reports two leaks after dvb_register_frontend() failure

[Shuangpeng]

Hi Kernel Maintainers,

I hit the following kmemleak reports while testing current upstream kernel:

kmemleak: unreferenced object in as102_usb_probe
kmemleak: unreferenced object in as102_attach

on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026)

The reproducer and .config files are here.
https://gist.github.com/shuangpengbai/f122f8acb8a9e4b9ed08d6a76dd5eb79

I’m happy to test debug patches or provide additional information.

Reported-by: Shuangpeng Bai <shuangpeng.kernel@xxxxxxxxx>

unreferenced object 0xffff88811641a000 (size 4096):
comm "kworker/1:1", pid 30, jiffies 4295053869
hex dump (first 32 bytes):
40 b3 2a 8b ff ff ff ff 00 70 47 66 81 88 ff ff  @.*......pGf....
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
backtrace (crc 52c16f09):
__kmalloc_cache_noprof (./include/linux/kmemleak.h:44 mm/slub.c:4575 mm/slub.c:4899 mm/slub.c:5415)
as102_usb_probe (./include/linux/slab.h:950 ./include/linux/slab.h:1188 drivers/media/usb/as102/as102_usb_drv.c:348)
usb_probe_interface (drivers/usb/core/driver.c:396)
really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)
__driver_probe_device (drivers/base/dd.c:871)
driver_probe_device (drivers/base/dd.c:901)
__device_attach_driver (drivers/base/dd.c:1029)
bus_for_each_drv (drivers/base/bus.c:500)
__device_attach (drivers/base/dd.c:1101)
device_initial_probe (drivers/base/dd.c:1156)
bus_probe_device (drivers/base/bus.c:613)
device_add (drivers/base/core.c:3706)
usb_set_configuration (drivers/usb/core/message.c:2268)
usb_generic_driver_probe (drivers/usb/core/generic.c:250)
usb_probe_device (drivers/usb/core/driver.c:291)
really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)

unreferenced object 0xffff888166471000 (size 2048):
comm "kworker/1:1", pid 30, jiffies 4295053870
hex dump (first 32 bytes):
01 00 00 00 00 00 00 00 41 62 69 6c 69 73 20 53  ........Abilis S
79 73 74 65 6d 73 20 44 56 42 2d 54 69 74 61 6e  ystems DVB-Titan
backtrace (crc f72415e5):
__kmalloc_cache_noprof (./include/linux/kmemleak.h:44 mm/slub.c:4575 mm/slub.c:4899 mm/slub.c:5415)
as102_attach (./include/linux/slab.h:950 ./include/linux/slab.h:1188 drivers/media/dvb-frontends/as102_fe.c:450)
as102_dvb_register (drivers/media/usb/as102/as102_drv.c:326)
as102_usb_probe (drivers/media/usb/as102/as102_usb_drv.c:397)
usb_probe_interface (drivers/usb/core/driver.c:396)
really_probe (drivers/base/dd.c:? drivers/base/dd.c:709)
__driver_probe_device (drivers/base/dd.c:871)
driver_probe_device (drivers/base/dd.c:901)
__device_attach_driver (drivers/base/dd.c:1029)
bus_for_each_drv (drivers/base/bus.c:500)
__device_attach (drivers/base/dd.c:1101)
device_initial_probe (drivers/base/dd.c:1156)
bus_probe_device (drivers/base/bus.c:613)
device_add (drivers/base/core.c:3706)
usb_set_configuration (drivers/usb/core/message.c:2268)
usb_generic_driver_probe (drivers/usb/core/generic.c:250)

Best,
Shuangpeng