From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f206.google.com (mail-oi1-f206.google.com [209.85.167.206]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1B90A26F289 for ; Sun, 16 Aug 2026 03:03:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.206 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786849408; cv=none; b=n0uFLNPW7JiOF1jJqnPCZ+b3Ign0C96iZhQ3E2YOC+7AUCgClbVNuI7IhzfdJsUj4rTyTou4Kdi3Fn9ZHBt9WLrE65fYaGoK0U+e+tz+fSrDBQ7iXAWGh/AGUw6qOGekoA69CnDjCWTY7GPBYPddC85h1bGTSdO4r3AvbVQi5Ms= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786849408; c=relaxed/simple; bh=g0KUZMw1u4HQPch5nYUd1lr1LSu5GK06o3lj4XKCLw4=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=MnB9lpZhQLWzzji0pxpj2NPHmoZOLRnLMJlobCJUhBLp4EW8bp4Aq0V9NxfKVOjL1Tv1hMgfqDTSJ34tZhiflLhNNDEj1y9Wt8nsdqsYrfRdDcAfFDzgiZF4b8nA1MkjUxiWQnrIv+FdrTGALjFWIZ+sGlrGrZjBWYspdWFiHEQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.167.206 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oi1-f206.google.com with SMTP id 5614622812f47-4b1bd347d5fso2507230b6e.3 for ; Sat, 15 Aug 2026 20:03:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786849406; x=1787454206; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=9m520KaLscAfCgGCZaFiJOW4gVCeAekV+h/SU3kvUSk=; b=UJA55/lO6lLkVNxc842aqGp8puFPcIAHML/vItsu8YcsrxjpBsHpm6OJrPOIN/RT17 kqOiHPa28o6lLK53XDUujJgti/mHcN0ESiPGd6hHkkKWbvPmH+nq0mvJIsMKW96AXoTs y4NLREsIcMsbqRROKcBRZOu/K0/ZjK/O8BcAC+Pcf8hT+MOFWUDpzrm7Guzx9vEGkvg0 Jmto+mQ04MgBNAdfDGWs4ay6QjA2LrTedErJs0+C+W5s3cbQPGCR56WPwmh90M6r3MPj tBna+fQz1L7qzxnhjF+CcGpK/F2tHdKl4X1m8Oi0bz48VpCZxrnX7CshKgh/OD7Rw9Va A+Rg== X-Forwarded-Encrypted: i=1; AHgh+Rr/Of4m67KdfUMMhuPZNwBR6/YgdQ0kipZiK7scXtoBdeb28/nhSZLMfGY01AnttXIlXezElgUSg7pdm1I=@vger.kernel.org X-Gm-Message-State: AOJu0Ywkb+Qys2FGKoQaw55H66MuNWBSwpTxknDPpgOgD4tKuOWfWPuc ZshqIyTkYWKOH4DXUwwDc5Mfzy+INFq7thGKQaj91RRzcgbUBF8bSpYTZoNh04GVjeLE1hYp4N4 RshP69zW/uBVVCzhdcdykk2SrKdn/fgGUJ0dyxUBE8cTVBcfJPLnlt/Cy/Vs= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1496:b0:497:e7e2:756e with SMTP id 5614622812f47-4b241e05d17mr16562656b6e.13.1786849406101; Sat, 15 Aug 2026 20:03:26 -0700 (PDT) Date: Sat, 15 Aug 2026 20:03:26 -0700 In-Reply-To: <683199ed.a70a0220.29d4a0.07f6.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a81287e.10853dc7.22f513.000c.GAE@google.com> Subject: Re: [syzbot] [input?] [usb?] KASAN: slab-use-after-free Read in report_descriptor_read From: syzbot To: bentiss@kernel.org, jikos@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: bdab5605259b usb: gadget: uvc: fix dangling pointers in uv.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=163fb279580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8bdeea7ee6735f91 dashboard link: https://syzkaller.appspot.com/bug?extid=bc537ca7a0efe33988eb compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1108aa25580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2cb2fdbdd7b7/disk-bdab5605.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f801d31c2001/vmlinux-bdab5605.xz kernel image: https://storage.googleapis.com/syzbot-assets/9002a6e0ae14/bzImage-bdab5605.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bc537ca7a0efe33988eb@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in report_descriptor_read+0xbb/0x100 drivers/hid/hid-core.c:2272 Read of size 24 at addr ffff888120aa1480 by task fido_id/6160 CPU: 1 UID: 0 PID: 6160 Comm: fido_id Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:186 [inline] kasan_check_range+0x10f/0x1e0 mm/kasan/generic.c:200 __asan_memcpy+0x23/0x60 mm/kasan/shadow.c:105 report_descriptor_read+0xbb/0x100 drivers/hid/hid-core.c:2272 sysfs_kf_bin_read+0x156/0x210 fs/sysfs/file.c:102 kernfs_file_read_iter fs/kernfs/file.c:262 [inline] kernfs_fop_read_iter+0x32b/0x610 fs/kernfs/file.c:291 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x82e/0xb40 fs/read_write.c:574 ksys_read+0x12a/0x250 fs/read_write.c:716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fcdd3a5e407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd1213c0d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fcdd3970880 RCX: 00007fcdd3a5e407 RDX: 0000000000001000 RSI: 00007ffd1213c120 RDI: 0000000000000004 RBP: 0000558f17e1d2c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000558f17e1c4c0 R13: 00007ffd1213c120 R14: 0000000000000004 R15: 0000558ee8aae4d8 Allocated by task 2921: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5334 [inline] __kmalloc_node_track_caller_noprof+0x318/0x7d0 mm/slub.c:5471 kmemdup_noprof+0x29/0x60 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:715 [inline] hid_open_report+0x214/0x810 drivers/hid/hid-core.c:1376 hid_parse include/linux/hid.h:1206 [inline] lg_probe+0x246/0x7e0 drivers/hid/hid-lg.c:783 __hid_device_probe drivers/hid/hid-core.c:2829 [inline] hid_device_probe+0x50e/0x800 drivers/hid/hid-core.c:2866 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 hid_add_device+0x2bf/0x440 drivers/hid/hid-core.c:3010 usbhid_probe+0xa64/0x10b0 drivers/hid/usbhid/hid-core.c:1452 usb_probe_interface+0x386/0x9b0 drivers/usb/core/driver.c:399 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2268 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:628 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:706 __driver_probe_device+0x20e/0x450 drivers/base/dd.c:868 driver_probe_device+0x4a/0x140 drivers/base/dd.c:898 __device_attach_driver+0x1df/0x320 drivers/base/dd.c:1026 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1098 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1153 bus_probe_device+0x64/0x160 drivers/base/bus.c:620 device_add+0x121d/0x1970 drivers/base/core.c:3772 usb_new_device.part.0+0xcc2/0x1686 drivers/usb/core/hub.c:2708 usb_new_device drivers/usb/core/hub.c:5833 [inline] hub_port_connect drivers/usb/core/hub.c:5580 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event.cold+0x51a/0xe9d drivers/usb/core/hub.c:5966 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888120aa1480 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of freed 32-byte region [ffff888120aa1480, ffff888120aa14a0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120aa1 flags: 0x200000000000000(node=0|zone=2) page_type: f5(slab) raw: 0200000000000000 ffff888100041780 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800400040 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4145, tgid 4145 (modprobe), ts 107921942180, free_ts 107809260171 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0xf25/0x3400 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x28f/0x2b90 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x670 mm/slub.c:3426 refill_objects+0xe3/0x410 mm/slub.c:7310 refill_sheaf mm/slub.c:2804 [inline] __pcs_replace_empty_main+0x376/0x680 mm/slub.c:4675 alloc_from_pcs mm/slub.c:4773 [inline] slab_alloc_node mm/slub.c:4905 [inline] __kmalloc_cache_noprof+0x50e/0x670 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] slab_free_hook mm/slub.c:2629 [inline] slab_free mm/slub.c:6377 [inline] kmem_cache_free+0x3f3/0x650 mm/slub.c:6504 file_free fs/file_table.c:104 [inline] __fput+0x68d/0xb50 fs/file_table.c:525 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x8d2/0x2a50 kernel/exit.c:1009 do_group_exit+0xd5/0x2a0 kernel/exit.c:1152 __do_sys_exit_group kernel/exit.c:1163 [inline] __se_sys_exit_group kernel/exit.c:1161 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1161 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x10b/0x7f0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 14 tgid 14 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x716/0xf50 mm/page_alloc.c:2950 rcu_do_batch kernel/rcu/tree.c:2645 [inline] rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2897 handle_softirqs+0x1dd/0x990 kernel/softirq.c:622 run_ksoftirqd kernel/softirq.c:1076 [inline] run_ksoftirqd+0x38/0x60 kernel/softirq.c:1068 smpboot_thread_fn+0x3d3/0xaa0 kernel/smpboot.c:160 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888120aa1380: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff888120aa1400: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc >ffff888120aa1480: fb fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ^ ffff888120aa1500: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ffff888120aa1580: fa fb fb fb fc fc fc fc fa fb fb fb fc fc fc fc ================================================================== --- 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.