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Message-ID: <692613aa.a70a0220.d98e3.00bd.GAE@google.com>
Date: Tue, 25 Nov 2025 12:38:02 -0800
From: syzbot <syzbot+a41b73dce23962a74c72@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org, 
	linux-usb@...r.kernel.org, ssranevjti@...il.com, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] [usb?] memory leak in v4l2_ctrl_handler_init_class
 (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in v4l2_ctrl_handler_init_class

BUG: memory leak
unreferenced object 0xffff88812b84cfc0 (size 8):
  comm "kworker/0:7", pid 6710, jiffies 4294946048
  hex dump (first 8 bytes):
    40 fc ec 19 81 88 ff ff                          @.......
  backtrace (crc 82d035d3):
    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 0xffff888119edee00 (size 256):
  comm "kworker/0:7", pid 6710, jiffies 4294946048
  hex dump (first 32 bytes):
    00 a0 ef 19 81 88 ff ff 00 ef ed 19 81 88 ff ff  ................
    10 ee ed 19 81 88 ff ff 10 ee ed 19 81 88 ff ff  ................
  backtrace (crc 3c002570):
    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 0xffff888119edef00 (size 256):
  comm "kworker/0:7", pid 6710, jiffies 4294946048
  hex dump (first 32 bytes):
    00 ee ed 19 81 88 ff ff 30 fd 58 26 81 88 ff ff  ........0.X&....
    10 ef ed 19 81 88 ff ff 10 ef ed 19 81 88 ff ff  ................
  backtrace (crc 61944fdf):
    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 0xffff888119ecfb40 (size 64):
  comm "kworker/0:7", pid 6710, jiffies 4294946048
  hex dump (first 32 bytes):
    80 fb ec 19 81 88 ff ff 40 fd 58 26 81 88 ff ff  ........@.......
    00 00 00 00 00 00 00 00 00 ef ed 19 81 88 ff ff  ................
  backtrace (crc 96c5954f):
    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 0xffff888119ecfb80 (size 64):
  comm "kworker/0:7", pid 6710, jiffies 4294946048
  hex dump (first 32 bytes):
    00 fb ec 19 81 88 ff ff 40 fb ec 19 81 88 ff ff  ........@.......
    40 fb ec 19 81 88 ff ff 00 ee ed 19 81 88 ff ff  @...............
  backtrace (crc ef37c6b5):
    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


Tested on:

commit:         30f09200 Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17c4f8b4580000
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

Note: no patches were applied.

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