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Message-ID: <692560ec.a70a0220.2ea503.0087.GAE@google.com>
Date: Mon, 24 Nov 2025 23:55:24 -0800
From: syzbot <syzbot+a41b73dce23962a74c72@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
	linux-usb@...r.kernel.org, mchehab@...nel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [media?] [usb?] memory leak in v4l2_ctrl_handler_init_class (2)

Hello,

syzbot found the following issue on:

HEAD commit:    fd95357fd8c6 Merge tag 'sched_ext-for-6.18-rc6-fixes-2' of..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14a39742580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f30cc590c4f6da44
dashboard link: https://syzkaller.appspot.com/bug?extid=a41b73dce23962a74c72
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16b05a12580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10f8aa12580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/23b612a7fe35/disk-fd95357f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2da12b65fa76/vmlinux-fd95357f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/97ebacdc6971/bzImage-fd95357f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a41b73dce23962a74c72@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88812a347a58 (size 8):
  comm "kworker/0:6", pid 6036, jiffies 4294942408
  hex dump (first 8 bytes):
    80 38 6e 25 81 88 ff ff                          .8n%....
  backtrace (crc f78d2928):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __do_kmalloc_node mm/slub.c:5649 [inline]
    __kvmalloc_node_noprof+0x51c/0x820 mm/slub.c:7112
    kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline]
    v4l2_ctrl_handler_init_class+0x67/0x90 drivers/media/v4l2-core/v4l2-ctrls-core.c:1625
    usb_keene_probe+0xc4/0x450 drivers/media/radio/radio-keene.c:326
    usb_probe_interface+0x173/0x3f0 drivers/usb/core/driver.c:396
    call_driver_probe drivers/base/dd.c:581 [inline]
    really_probe+0x12f/0x430 drivers/base/dd.c:659
    __driver_probe_device+0xc3/0x1a0 drivers/base/dd.c:801
    driver_probe_device+0x2a/0x120 drivers/base/dd.c:831
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:959
    bus_for_each_drv+0xcf/0x120 drivers/base/bus.c:462
    __device_attach+0xf9/0x290 drivers/base/dd.c:1031
    bus_probe_device+0xcd/0xe0 drivers/base/bus.c:537
    device_add+0x983/0xc80 drivers/base/core.c:3689
    usb_set_configuration+0x961/0xc70 drivers/usb/core/message.c:2210
    usb_generic_driver_probe+0x83/0xd0 drivers/usb/core/generic.c:250
    usb_probe_device+0x7c/0x1d0 drivers/usb/core/driver.c:291
    call_driver_probe drivers/base/dd.c:581 [inline]
    really_probe+0x12f/0x430 drivers/base/dd.c:659

BUG: memory leak
unreferenced object 0xffff888126df0200 (size 256):
  comm "kworker/0:6", pid 6036, jiffies 4294942408
  hex dump (first 32 bytes):
    00 0b df 26 81 88 ff ff 00 09 df 26 81 88 ff ff  ...&.......&....
    10 02 df 26 81 88 ff ff 10 02 df 26 81 88 ff ff  ...&.......&....
  backtrace (crc 602da918):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __do_kmalloc_node mm/slub.c:5649 [inline]
    __kvmalloc_node_noprof+0x51c/0x820 mm/slub.c:7112
    v4l2_ctrl_new+0x2bf/0x1340 drivers/media/v4l2-core/v4l2-ctrls-core.c:2031
    v4l2_ctrl_new_std+0x122/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
    usb_keene_probe+0xe8/0x450 drivers/media/radio/radio-keene.c:327
    usb_probe_interface+0x173/0x3f0 drivers/usb/core/driver.c:396
    call_driver_probe drivers/base/dd.c:581 [inline]
    really_probe+0x12f/0x430 drivers/base/dd.c:659
    __driver_probe_device+0xc3/0x1a0 drivers/base/dd.c:801
    driver_probe_device+0x2a/0x120 drivers/base/dd.c:831
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:959
    bus_for_each_drv+0xcf/0x120 drivers/base/bus.c:462
    __device_attach+0xf9/0x290 drivers/base/dd.c:1031
    bus_probe_device+0xcd/0xe0 drivers/base/bus.c:537
    device_add+0x983/0xc80 drivers/base/core.c:3689
    usb_set_configuration+0x961/0xc70 drivers/usb/core/message.c:2210
    usb_generic_driver_probe+0x83/0xd0 drivers/usb/core/generic.c:250
    usb_probe_device+0x7c/0x1d0 drivers/usb/core/driver.c:291

BUG: memory leak
unreferenced object 0xffff888126df0900 (size 256):
  comm "kworker/0:6", pid 6036, jiffies 4294942408
  hex dump (first 32 bytes):
    00 02 df 26 81 88 ff ff 30 f5 8f 24 81 88 ff ff  ...&....0..$....
    10 09 df 26 81 88 ff ff 10 09 df 26 81 88 ff ff  ...&.......&....
  backtrace (crc 84e60c55):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __do_kmalloc_node mm/slub.c:5649 [inline]
    __kvmalloc_node_noprof+0x51c/0x820 mm/slub.c:7112
    v4l2_ctrl_new+0x2bf/0x1340 drivers/media/v4l2-core/v4l2-ctrls-core.c:2031
    v4l2_ctrl_new_std+0x122/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
    handler_new_ref+0x352/0x450 drivers/media/v4l2-core/v4l2-ctrls-core.c:1772
    v4l2_ctrl_new+0x67d/0x1340 drivers/media/v4l2-core/v4l2-ctrls-core.c:2114
    v4l2_ctrl_new_std+0x122/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
    usb_keene_probe+0xe8/0x450 drivers/media/radio/radio-keene.c:327
    usb_probe_interface+0x173/0x3f0 drivers/usb/core/driver.c:396
    call_driver_probe drivers/base/dd.c:581 [inline]
    really_probe+0x12f/0x430 drivers/base/dd.c:659
    __driver_probe_device+0xc3/0x1a0 drivers/base/dd.c:801
    driver_probe_device+0x2a/0x120 drivers/base/dd.c:831
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:959
    bus_for_each_drv+0xcf/0x120 drivers/base/bus.c:462
    __device_attach+0xf9/0x290 drivers/base/dd.c:1031
    bus_probe_device+0xcd/0xe0 drivers/base/bus.c:537
    device_add+0x983/0xc80 drivers/base/core.c:3689

BUG: memory leak
unreferenced object 0xffff8881256e3400 (size 64):
  comm "kworker/0:6", pid 6036, jiffies 4294942408
  hex dump (first 32 bytes):
    40 33 6e 25 81 88 ff ff 40 f5 8f 24 81 88 ff ff  @3n%....@.......
    00 00 00 00 00 00 00 00 00 09 df 26 81 88 ff ff  ...........&....
  backtrace (crc a7c4a093):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __do_kmalloc_node mm/slub.c:5649 [inline]
    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5662
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    handler_new_ref+0xd7/0x450 drivers/media/v4l2-core/v4l2-ctrls-core.c:1780
    v4l2_ctrl_new+0x67d/0x1340 drivers/media/v4l2-core/v4l2-ctrls-core.c:2114
    v4l2_ctrl_new_std+0x122/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
    handler_new_ref+0x352/0x450 drivers/media/v4l2-core/v4l2-ctrls-core.c:1772
    v4l2_ctrl_new+0x67d/0x1340 drivers/media/v4l2-core/v4l2-ctrls-core.c:2114
    v4l2_ctrl_new_std+0x122/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
    usb_keene_probe+0xe8/0x450 drivers/media/radio/radio-keene.c:327
    usb_probe_interface+0x173/0x3f0 drivers/usb/core/driver.c:396
    call_driver_probe drivers/base/dd.c:581 [inline]
    really_probe+0x12f/0x430 drivers/base/dd.c:659
    __driver_probe_device+0xc3/0x1a0 drivers/base/dd.c:801
    driver_probe_device+0x2a/0x120 drivers/base/dd.c:831
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:959
    bus_for_each_drv+0xcf/0x120 drivers/base/bus.c:462
    __device_attach+0xf9/0x290 drivers/base/dd.c:1031
    bus_probe_device+0xcd/0xe0 drivers/base/bus.c:537

BUG: memory leak
unreferenced object 0xffff8881256e3340 (size 64):
  comm "kworker/0:6", pid 6036, jiffies 4294942408
  hex dump (first 32 bytes):
    80 32 6e 25 81 88 ff ff 00 34 6e 25 81 88 ff ff  .2n%.....4n%....
    00 34 6e 25 81 88 ff ff 00 02 df 26 81 88 ff ff  .4n%.......&....
  backtrace (crc be938ee5):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4983 [inline]
    slab_alloc_node mm/slub.c:5288 [inline]
    __do_kmalloc_node mm/slub.c:5649 [inline]
    __kmalloc_noprof+0x3e3/0x6b0 mm/slub.c:5662
    kmalloc_noprof include/linux/slab.h:961 [inline]
    kzalloc_noprof include/linux/slab.h:1094 [inline]
    handler_new_ref+0xd7/0x450 drivers/media/v4l2-core/v4l2-ctrls-core.c:1780
    v4l2_ctrl_new+0x67d/0x1340 drivers/media/v4l2-core/v4l2-ctrls-core.c:2114
    v4l2_ctrl_new_std+0x122/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
    usb_keene_probe+0xe8/0x450 drivers/media/radio/radio-keene.c:327
    usb_probe_interface+0x173/0x3f0 drivers/usb/core/driver.c:396
    call_driver_probe drivers/base/dd.c:581 [inline]
    really_probe+0x12f/0x430 drivers/base/dd.c:659
    __driver_probe_device+0xc3/0x1a0 drivers/base/dd.c:801
    driver_probe_device+0x2a/0x120 drivers/base/dd.c:831
    __device_attach_driver+0x10f/0x170 drivers/base/dd.c:959
    bus_for_each_drv+0xcf/0x120 drivers/base/bus.c:462
    __device_attach+0xf9/0x290 drivers/base/dd.c:1031
    bus_probe_device+0xcd/0xe0 drivers/base/bus.c:537
    device_add+0x983/0xc80 drivers/base/core.c:3689
    usb_set_configuration+0x961/0xc70 drivers/usb/core/message.c:2210
    usb_generic_driver_probe+0x83/0xd0 drivers/usb/core/generic.c:250

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

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