From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f208.google.com (mail-oi1-f208.google.com [209.85.167.208]) (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 7B1C32EB874 for ; Fri, 31 Jul 2026 01:35:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785461742; cv=none; b=rkRZxopgGx+kLSTSPtuwf3MXR939YJQN06O4eRZw8kpysCvVs15xBM9WI4BSMtuKwqEKNuPE4+tTF3GhW0ocVobB3hKyIdEbiZI05V1BHhm2ksGC3PNgosmakpdLHgnf3fh9qpO1tsXv44tQxCBZPJEqR49eIciELO+/+XlmWlg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785461742; c=relaxed/simple; bh=eSpxb4pxm5qAGK2TGdMUYWeS1d76pVMBtFwE7eehSzY=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=GP2qAkEQ8he/MNAw1XAHRMXPgpwqUgFRSGpZVYxHeOTf7uIbC99vi+oce8/FKJRrKY3FFztc1Lqc1YyRp7J9zJou80shQC5wpNiI86Jps0eQ8YeE6N4ZBJs3TKETg2oH7YOLBo87x8bB1RcVBL8b3j1gs7tTSCfXjaJ6LDVlzak= 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=209.85.167.208 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-f208.google.com with SMTP id 5614622812f47-4a41f46d629so642877b6e.3 for ; Thu, 30 Jul 2026 18:35:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785461739; x=1786066539; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=QwlWcgkEqR+3C090wQuoiMqnwDPz9M68QVdov0+/g7g=; b=Jhd8FEcrF/lv5YR7oLv4IWKBk0AKn6Q4VgNjZBWkTdhJDrJeDb8GIBDFxsk15x+iFu waSEdYf3s/INkIIFdq5TyCiYBq0Md6OzVntdJV7xvu1cUWtGumKSWJZcFHl9Rs0xnz47 3SiFFtgeB8xFnVeCxtz8vXgyWYXldofberO1+DIrX2o9XFxSpNoh392hCCIa6EjCqMtM ziYpOQ3jQ8Xpiohf9hJN93ENGaCdr+Xx1gHB1EHV+QLUGlYvp/TiiPkshoZFgsHkjLMb Y8jjO91C/jfcwEwSgvSwmPSmToqz+3xuhYUOec1t8++IQHYI8c6LnbovkiZZzYCwWwHy PLOw== X-Forwarded-Encrypted: i=1; AHgh+RoWEJ+YOaquCHfaf0sJ7MNUmTJMmCGA+jnQvLlAXgYIAAyEVx/Nohg51Z0gcJG+je+UG8V5yFLnJHX08Q==@lists.linux.dev X-Gm-Message-State: AOJu0YzAFmz7YW6mNHGJVsG5/PnlcqsbLWavuiMjgrQ3nySqMLSWvvQT WmxfVU7OHnYn5Bx07CzVG5qFczijsMn+3CSgtqo1is7O4uZ0ypQJh3r63tMA5iXfH0f2df1Yzui QZ9KAH3HThMEd6yMUkZ53q/4lWVIgbNE7YD4ct82F8EVbeKDh6qnzVaXFjbM= Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:509e:b0:4a4:934:4232 with SMTP id 5614622812f47-4ad879d8ff5mr4201192b6e.39.1785461739432; Thu, 30 Jul 2026 18:35:39 -0700 (PDT) Date: Thu, 30 Jul 2026 18:35:39 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6bfbeb.5cf34cee.28a846.0004.GAE@google.com> Subject: [syzbot] [kernel?] KASAN: slab-use-after-free Read in raw_ioctl From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3b5f4b83c4ab Merge tag 'for-7.2-rc5-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1214003e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=d65a1f23d3bb8e21ffb5 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f99ca00b02a2/disk-3b5f4b83.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5caff5208bfc/vmlinux-3b5f4b83.xz kernel image: https://storage.googleapis.com/syzbot-assets/c0e941f5f816/bzImage-3b5f4b83.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d65a1f23d3bb8e21ffb5@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:648 [inline] BUG: KASAN: slab-use-after-free in string+0x471/0x4d0 lib/vsprintf.c:730 Read of size 1 at addr ffff88802c7ca0c0 by task syz.0.3761/21621 CPU: 0 UID: 0 PID: 21621 Comm: syz.0.3761 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 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 string_nocheck lib/vsprintf.c:648 [inline] string+0x471/0x4d0 lib/vsprintf.c:730 vsnprintf+0x422/0x1300 lib/vsprintf.c:2945 snprintf+0xc7/0x100 lib/vsprintf.c:3043 set_dev_info drivers/base/core.c:4984 [inline] dev_vprintk_emit+0x375/0x3e0 drivers/base/core.c:4994 dev_printk_emit+0xd2/0x10d drivers/base/core.c:5007 __dev_printk+0xcb/0x100 drivers/base/core.c:5019 _dev_err+0xef/0x127 drivers/base/core.c:5062 raw_ioctl_ep0_stall drivers/usb/gadget/legacy/raw_gadget.c:827 [inline] raw_ioctl.cold+0x5d/0x3a6 drivers/usb/gadget/legacy/raw_gadget.c:1340 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0dead9db2b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007f0debcfef50 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f0dead9db2b RDX: 0000000000000000 RSI: 000000000000550c RDI: 0000000000000003 RBP: 00007f0deae33eaf R08: 0000000000000003 R09: 0000000000000409 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0deb025fa0 R15: 00007ffdb01d8f78 Allocated by task 1: 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+0xaa/0xb0 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+0x331/0x830 mm/slub.c:5471 kvasprintf+0xbc/0x150 lib/kasprintf.c:25 kvasprintf_const+0x66/0x1a0 lib/kasprintf.c:49 kobject_set_name_vargs+0x5a/0x140 lib/kobject.c:274 dev_set_name+0xc7/0x100 drivers/base/core.c:3560 usb_add_gadget+0x520/0x920 drivers/usb/gadget/udc/core.c:1459 usb_add_gadget_udc_release drivers/usb/gadget/udc/core.c:1517 [inline] usb_add_gadget_udc+0x26/0x70 drivers/usb/gadget/udc/core.c:1564 dummy_udc_probe+0x69e/0x960 drivers/usb/gadget/udc/dummy_hcd.c:1121 platform_probe+0x106/0x1d0 drivers/base/platform.c:1439 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 platform_device_add+0x35a/0x800 drivers/base/platform.c:762 dummy_hcd_init+0x803/0xc00 drivers/usb/gadget/udc/dummy_hcd.c:2894 do_one_initcall+0x11d/0x700 init/main.c:1347 do_initcall_level init/main.c:1409 [inline] do_initcalls init/main.c:1425 [inline] do_basic_setup init/main.c:1445 [inline] kernel_init_freeable+0x6ea/0x7b0 init/main.c:1658 kernel_init+0x1f/0x1e0 init/main.c:1548 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 21629: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2677 [inline] slab_free mm/slub.c:6377 [inline] kfree+0x22b/0x6c0 mm/slub.c:6692 kfree_const+0x5a/0x70 mm/util.c:46 kobject_cleanup lib/kobject.c:695 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x218/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3880 platform_remove+0x5f/0x80 drivers/base/platform.c:1456 device_remove+0xcb/0x180 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 unbind_store+0xf8/0x110 drivers/base/bus.c:244 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88802c7ca0c0 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes inside of freed 16-byte region [ffff88802c7ca0c0, ffff88802c7ca0d0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c7ca flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fe23640 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800800080 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 11136665373, free_ts 0 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+0xf48/0x3530 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304 alloc_slab_page mm/slub.c:3266 [inline] allocate_slab mm/slub.c:3380 [inline] new_slab+0xa2/0x640 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] __do_kmalloc_node mm/slub.c:5333 [inline] __kmalloc_node_track_caller_noprof+0x679/0x830 mm/slub.c:5471 kvasprintf+0xbc/0x150 lib/kasprintf.c:25 kvasprintf_const+0x66/0x1a0 lib/kasprintf.c:49 kobject_set_name_vargs+0x5a/0x140 lib/kobject.c:274 dev_set_name+0xc7/0x100 drivers/base/core.c:3560 usb_hub_create_port_device+0x3a4/0xe60 drivers/usb/core/port.c:783 hub_configure drivers/usb/core/hub.c:1734 [inline] hub_probe.cold+0x2974/0x2eda drivers/usb/core/hub.c:2001 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 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 page_owner free stack trace missing Memory state around the buggy address: ffff88802c7c9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802c7ca000: 00 04 fc fc 00 04 fc fc 00 04 fc fc 00 01 fc fc >ffff88802c7ca080: 00 00 fc fc 00 01 fc fc fa fb fc fc 00 04 fc fc ^ ffff88802c7ca100: 00 04 fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc ffff88802c7ca180: 00 00 fc fc fa fb fc fc 00 04 fc fc 00 04 fc fc ================================================================== --- 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@googlegroups.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 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