From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f78.google.com (mail-ot1-f78.google.com [209.85.210.78]) (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 ADED9226D05 for ; Wed, 29 Jul 2026 00:19:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785284374; cv=none; b=OZFlqaMv8dSdQxtoJ3WXphmYUGqIN8eDPI2x+J8XwRzTNlTtxqrMO+uZ2CV5f6IdY+x+sxGHZmvWNGMtO15/XUjH4EDOqJfXPfFD0umrKnqGvwLihBMVkfRYVtkNrULRlcb2a+1FJ9bjl+qPCNwii+0riHcZcN+I3nsLOdYAWyw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785284374; c=relaxed/simple; bh=goA6KH0gb0GCH2tepaowFCS9L4yknnU1rS8gtbVCoFc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=SC8LUAiW5mN/0b3lAdWAwsO+hSlo0gOJwl1WtkyGDGla9baII6Zmz4iPa0ycmFG6TzSeGQWFUx4m4snYp5CpD2wAMgc9NDRlXv3p/HrGJasor6H1KwBhyxOthotfcIJc5J51WVe/eMQNgQ9lGD5bcQjWo6SGoPDsONGYCWHpCbA= 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=209.85.210.78 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-ot1-f78.google.com with SMTP id 46e09a7af769-7e7624e584dso643246a34.2 for ; Tue, 28 Jul 2026 17:19:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785284371; x=1785889171; 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=HVYM5utsjBQdLZptAAOr82u0LnwsKduWVkk3IIKFoas=; b=XznXM9Lo+H1Xc2pbuotWn/HtdEpo6ngQWe1oYyltJF/QCFED6r0/YcdPdI2vcBFG7b +o8dst1iHuozjaVE+3MhuoTxVRFa38YCPtp0h/VZWzPJTStDrJJ8O93lC6T85fxO5xfM CbIAqVO0sh5zXjhpstHlUbxHNrdQB7tSPdLGE/lSq1ZObOK6+tZ6TuPiHQyo5hxIVLc2 JGw3ihioAQD1UKEP+16NJIyzxFZchF61H/rlj4ZP1PSOPtJpgNq11YjEmoUxcSYe7InZ ZD1WPUQ3OEK1G/HfNCd+2fodb+Rcb3D0bIrv9/BLtvaAXAM/0XbudE40BPb4pq9UVeZc 5DQg== X-Forwarded-Encrypted: i=1; AHgh+RoBi/6tdPj+16mMEbIZ+x72H1qMicBjkkqqUxEHn9HddmQLaXJKajt6KOPyPPUyZ4rVk6YYXLD5XWdIY6c=@vger.kernel.org X-Gm-Message-State: AOJu0Yz15kNJk9erMYDRQvnBm4+Ikj4p49DN2pgzr45dkg9QDnzN1TzT AAnZix5Omxznx0EiPj6i1sHmcT1UZDfFZlVolbSO5/m7898zxMB9HokEDkAOtPzUPzb31Cl4nL5 ofIpuiYTYvFMNaZmLH63gw5RJY91+r/oySb2dPmKpJEYXPBRy+zrJGbSVHtA= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:2226:b0:4a4:80be:3ae9 with SMTP id 5614622812f47-4ad5b9b7a52mr3266709b6e.28.1785284371704; Tue, 28 Jul 2026 17:19:31 -0700 (PDT) Date: Tue, 28 Jul 2026 17:19:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a694713.6bd615f2.c0aa.0005.GAE@google.com> Subject: [syzbot] [usb?] KASAN: slab-out-of-bounds Read in dummy_free_request From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: f5098b6bae76 Linux 7.2-rc5 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12a57fde580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=67d9d15423ddc0f15859 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/2113dcf433f6/disk-f5098b6b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/413e673b7de4/vmlinux-f5098b6b.xz kernel image: https://storage.googleapis.com/syzbot-assets/fc40c1b83e80/bzImage-f5098b6b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+67d9d15423ddc0f15859@syzkaller.appspotmail.com configfs-gadget.g1 gadget.0: uvc: uvc_function_bind() configfs-gadget.g1 gadget.0: uvc: Unable to allocate streaming EP ================================================================== BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:404 [inline] BUG: KASAN: slab-out-of-bounds in dummy_free_request+0x8a/0x90 drivers/usb/gadget/udc/dummy_hcd.c:710 Read of size 8 at addr ffff888036e3b8f0 by task syz.4.1352/10334 CPU: 0 UID: 0 PID: 10334 Comm: syz.4.1352 Not tainted syzkaller #0 PREEMPT(full) 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 list_empty include/linux/list.h:404 [inline] dummy_free_request+0x8a/0x90 drivers/usb/gadget/udc/dummy_hcd.c:710 uvc_function_bind+0x181a/0x1939 drivers/usb/gadget/function/f_uvc.c:893 usb_add_function+0x219/0x890 drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xd83/0x1960 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x28c/0xbf0 drivers/usb/gadget/udc/core.c:1662 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 __driver_attach+0x21f/0x5b0 drivers/base/dd.c:1292 bus_for_each_dev+0x13e/0x1d0 drivers/base/bus.c:383 bus_add_driver+0x305/0x5b0 drivers/base/bus.c:763 driver_register+0x1e2/0x360 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0x132/0x210 drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x1b0/0x2e0 drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229 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 RIP: 0033:0x7f5f1ff9de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5f20ebb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f5f20225fa0 RCX: 00007f5f1ff9de99 RDX: 000000000000000b RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007f5f20033eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5f20226038 R14: 00007f5f20225fa0 R15: 00007ffc17e5ad58 Allocated by task 7091: 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] __kmalloc_cache_noprof+0x2e5/0x6c0 mm/slub.c:5489 _kmalloc_noprof include/linux/slab.h:988 [inline] __hw_addr_create+0x57/0x220 net/core/dev_addr_lists.c:62 __hw_addr_add_ex+0x32b/0x650 net/core/dev_addr_lists.c:120 __hw_addr_add net/core/dev_addr_lists.c:137 [inline] dev_addr_init+0x161/0x250 net/core/dev_addr_lists.c:689 alloc_netdev_mqs+0x363/0x15c0 net/core/dev.c:12071 rtnl_create_link+0xc13/0xf80 net/core/rtnetlink.c:3721 rtnl_newlink_create net/core/rtnetlink.c:3903 [inline] __rtnl_newlink net/core/rtnetlink.c:4044 [inline] rtnl_newlink+0x13bd/0x2380 net/core/rtnetlink.c:4159 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7076 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:775 [inline] __sock_sendmsg net/socket.c:790 [inline] __sys_sendto+0x48b/0x4e0 net/socket.c:2252 __do_sys_sendto net/socket.c:2259 [inline] __se_sys_sendto net/socket.c:2255 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2255 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 ffff888036e3b800 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 136 bytes to the right of allocated 104-byte region [ffff888036e3b800, ffff888036e3b868) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x36e3b flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fe23a00 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5623, tgid 5623 (syz-executor), ts 68307235957, free_ts 68280352608 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] __kmalloc_cache_noprof+0x479/0x6c0 mm/slub.c:5485 _kmalloc_noprof include/linux/slab.h:988 [inline] __hw_addr_create+0x57/0x220 net/core/dev_addr_lists.c:62 __hw_addr_add_ex+0x32b/0x650 net/core/dev_addr_lists.c:120 __dev_mc_add net/core/dev_addr_lists.c:998 [inline] dev_mc_add+0xb6/0x110 net/core/dev_addr_lists.c:1016 ip_mc_filter_add net/ipv4/igmp.c:1186 [inline] igmp_group_added+0x83a/0x9a0 net/ipv4/igmp.c:1375 ____ip_mc_inc_group+0x7e3/0x10d0 net/ipv4/igmp.c:1591 br_ip4_multicast_join_snoopers.isra.0+0x152/0x400 net/bridge/br_multicast.c:4162 br_multicast_join_snoopers+0x8b/0x120 net/bridge/br_multicast.c:4182 br_dev_open+0x112/0x150 net/bridge/br_device.c:174 __dev_open+0x3ad/0x8f0 net/core/dev.c:1702 page last free pid 23 tgid 23 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0x79f/0x1090 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+0x1ea/0x9b0 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+0x72b/0xd50 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: ffff888036e3b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888036e3b800: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc >ffff888036e3b880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888036e3b900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888036e3b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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