From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 7EFF53C3F6F for ; Tue, 28 Jul 2026 13:52:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785246761; cv=none; b=rfT/j1SRLLPPisCJzHlxSiqtdUt7qOA6yQBrA2zLfS01v47uWkOim6Z6j5PqmFxdnD+ywusRPnoYC7vNJacxTHiYTJBfWKBDeu/ZYZYUUtBbOgeS/IB6PotVWQMReGRNmirHBV423SKUygFIv76VaJ9lNH6lxEUm4cL+YFib4QY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785246761; c=relaxed/simple; bh=VjN375xNsYITYnTRt42h+7wtO5ND0L78c5UlEkNrA3o=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Vx7uezy1TJ6XbgyGYTPYOH5nlY56CdKIgDKbSWASXcC1GDqkET0kc+rDGjASgT2cbPrdpzje69G0g1oFSSAcnROh8GaVY4T2pf84ejQdJFFk4bx8rG56wiAG1mfYmC5SELwnJYX5UlQL4t8E0+3WTZQAh/x8FxFZ/xSKEeA9rcw= 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=209.85.167.207 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-f207.google.com with SMTP id 5614622812f47-4a4a7d0362eso4480582b6e.0 for ; Tue, 28 Jul 2026 06:52:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785246758; x=1785851558; 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=Mu7+3XgaXMksuJmmev6OMdLT0jHl/7Bmv74uvPcSWBU=; b=g0kpoOpLmlzOTrkHa7qBcSw4uFUxhDivE6PdW61s8+HffYw9JwMLxE0y3KFzGezwz1 Io0ZpBNqdRq7SWsINpTF+x/t2PB4IHRMdQddb9SgxBefd+UlWC1cBKH8RFCf9UcTuYAe +mKD6C4zb3ZAOIRL070C0tYhxSM2HYWZR1wFHutDlMo+77Kl8OGBPPL8XktQYaHbvVb7 jsUabCFMs/tOpuQVuClHBuEPPua/zBp14i9cV0P7WNfrK/klzw67quNqezfLeyFoExXI mx0Qe1vCMqVpK1D/EG/6poMkOqfX7YTiz8hlhXngiFuTy/FO0Qu+6LHBeqGqMGYHZVBb vqPQ== X-Forwarded-Encrypted: i=1; AHgh+RqO4StrrfL+V6jGKrKL+fDiogTEjuZ5XksJ9kGiw5AfHHSFiU4+fny2l4zVcoUU3azzHPDMGmS29ifbor4=@vger.kernel.org X-Gm-Message-State: AOJu0YzN9cTXbNVmKaGey8arY8TipUatoan9WLMzQddO77BNeFjtfKbc yOT6TISayPWzAb6GRIozgecp/qYSjoB91BLakI0J3SPAAZDFteBXYmMweDELidmWN/X4cY7WkxZ hQxWiDehHQePJwrNPM0oZd+mOQejjnk3FqeUJwXLkQ8zg28GL81DZ319DvAg= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:30a9:b0:4aa:cad:cb4c with SMTP id 5614622812f47-4ad5b59f5c6mr1548776b6e.1.1785246758646; Tue, 28 Jul 2026 06:52:38 -0700 (PDT) Date: Tue, 28 Jul 2026 06:52:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a68b426.b6659fcc.241ab8.00ea.GAE@google.com> Subject: [syzbot] [kernel?] KASAN: slab-use-after-free Read in raw_process_ep0_io 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: 0ce37745d4bf Merge tag 'block-7.2-20260724' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14712232580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=9aacea11bc70c3ddaff2 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/19521188f055/disk-0ce37745.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2f7922f1fe08/vmlinux-0ce37745.xz kernel image: https://storage.googleapis.com/syzbot-assets/1a7a0ce66cfa/bzImage-0ce37745.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9aacea11bc70c3ddaff2@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 ffff88802c5cd440 by task syz.0.4111/18826 CPU: 0 UID: 0 PID: 18826 Comm: syz.0.4111 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_process_ep0_io.cold+0x65/0x7f drivers/usb/gadget/legacy/raw_gadget.c:730 raw_ioctl_ep0_write drivers/usb/gadget/legacy/raw_gadget.c:767 [inline] raw_ioctl+0x1369/0x2b80 drivers/usb/gadget/legacy/raw_gadget.c:1313 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: 0033:0x7fcac599db2b 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:00007fcac683af50 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fcac599db2b RDX: 00007fcac683afd0 RSI: 0000000040085503 RDI: 0000000000000003 RBP: 00007fcac683afd0 R08: 0000000000000002 R09: 0000000000000409 R10: 0000000000000003 R11: 0000000000000246 R12: 00007fcac683afd8 R13: 00002000000011c0 R14: 00007fcac5c25fa0 R15: 00007ffc38c0ce58 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:1103 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:2880 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 18849: 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 ffff88802c5cd440 which belongs to the cache kmalloc-16 of size 16 The buggy address is located 0 bytes inside of freed 16-byte region [ffff88802c5cd440, ffff88802c5cd450) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c5cd flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fe22640 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 26, tgid 26 (kdevtmpfs), ts 9777113351, free_ts 0 create_dummy_stack mm/page_owner.c:103 [inline] register_dummy_stack+0x74/0xb0 mm/page_owner.c:109 init_page_owner+0x42/0xa10 mm/page_owner.c:127 invoke_init_callbacks mm/page_ext.c:152 [inline] page_ext_init+0x71d/0x780 mm/page_ext.c:490 mm_core_init+0x229/0x270 mm/mm_init.c:2741 page_owner free stack trace missing Memory state around the buggy address: ffff88802c5cd300: 00 01 fc fc 00 04 fc fc 00 04 fc fc 00 04 fc fc ffff88802c5cd380: 00 04 fc fc 00 04 fc fc 00 04 fc fc 00 04 fc fc >ffff88802c5cd400: 00 01 fc fc 00 01 fc fc fa fb fc fc 00 05 fc fc ^ ffff88802c5cd480: 00 01 fc fc 00 00 fc fc 00 07 fc fc 00 01 fc fc ffff88802c5cd500: 00 01 fc fc 00 01 fc fc 00 00 fc fc 00 01 fc fc ================================================================== --- This report is generated by a bot. 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