From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f200.google.com (mail-oi1-f200.google.com [209.85.167.200]) (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 3EB5C33FE09 for ; Sun, 11 Oct 2026 08:29:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791707383; cv=none; b=USJhQPY+ThYJbHd2M/5zJWWWUnWJlaXTrIhRpnL5YBNbcSDabYD5z1UP6FVgvOSYhgOQkQs+5nhVDAHSTukRFWQg9jEeIopiGFneqGw2ovYE6SEa8PvzOjF239P6+g3hpiphb0UF7FEykjjLOBtH5/JrDQ7bAvr7/468qGsyqC4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791707383; c=relaxed/simple; bh=0vuPLIw4xTywYGZ7S9XXR6BizcrvK1BtwaubE0dH18c=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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2002:a05:6808:2e4d:b0:4d6:92b3:5c84 with SMTP id 5614622812f47-50c58042fcfmr5768595b6e.65.1791707381187; Sun, 11 Oct 2026 01:29:41 -0700 (PDT) Date: Sun, 11 Oct 2026 01:29:41 -0700 In-Reply-To: <6a6d3a2e.6ce73036.24301b.0009.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6acb48f5.bbc4c7f9.15faa7.007e.GAE@google.com> Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Write in pn_bind From: syzbot To: gregkh@linuxfoundation.org, khiemtranzo532001@gmail.com, 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: a5ebb76233b7 Merge tag 'edac_urgent_for_v7.3_rc7' of git:/.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=15860f15580000 kernel config: https://syzkaller.appspot.com/x/.config?x=df4bbab1c2172b9f dashboard link: https://syzkaller.appspot.com/bug?extid=098999e05b6b877c01b3 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1506fc3e580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+098999e05b6b877c01b3@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in gphonet_set_gadget drivers/usb/gadget/function/f_phonet.c:720 [inline] BUG: KASAN: slab-use-after-free in pn_bind+0x106/0xb20 drivers/usb/gadget/function/f_phonet.c:510 Write of size 8 at addr ffff888034f78900 by task syz.0.19/6513 CPU: 0 UID: 0 PID: 6513 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 gphonet_set_gadget drivers/usb/gadget/function/f_phonet.c:720 [inline] pn_bind+0x106/0xb20 drivers/usb/gadget/function/f_phonet.c:510 usb_add_function+0x290/0x930 drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xde0/0x1410 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x2ca/0x9e0 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __driver_attach+0x339/0x600 drivers/base/dd.c:1292 bus_for_each_dev+0x23e/0x2c0 drivers/base/bus.c:383 bus_add_driver+0x348/0x670 drivers/base/bus.c:763 driver_register+0x23a/0x320 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x1c9/0x2f0 drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x33a/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8b0ad5e0d9 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:00007f8b0a3be028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8b0afe5fa0 RCX: 00007f8b0ad5e0d9 RDX: 000000000000000b RSI: 0000200000000280 RDI: 0000000000000003 RBP: 00007f8b0a3be090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f8b0afe6038 R14: 00007f8b0afe5fa0 R15: 00007ffddd2a1878 Allocated by task 6508: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5414 [inline] __kvmalloc_node_noprof+0x5b4/0x890 mm/slub.c:7015 alloc_netdev_mqs+0xa9/0x12c0 net/core/dev.c:12163 gphonet_setup_default drivers/usb/gadget/function/f_phonet.c:706 [inline] phonet_alloc_inst+0xa4/0x190 drivers/usb/gadget/function/f_phonet.c:640 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xe3/0x2f0 drivers/usb/gadget/functions.c:44 function_make+0x127/0x360 drivers/usb/gadget/configfs.c:626 configfs_mkdir+0x4f6/0x9e0 fs/configfs/dir.c:1369 vfs_mkdir+0x408/0x620 fs/namei.c:5439 filename_mkdirat+0x289/0x520 fs/namei.c:5472 __do_sys_mkdirat fs/namei.c:5493 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5490 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6510: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kfree+0x1c5/0x6d0 mm/slub.c:6802 device_release+0xc4/0x1f0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x222/0x550 lib/kobject.c:737 gphonet_register_netdev drivers/usb/gadget/function/f_phonet.c:729 [inline] pn_bind+0x131/0xb20 drivers/usb/gadget/function/f_phonet.c:511 usb_add_function+0x290/0x930 drivers/usb/gadget/composite.c:333 configfs_composite_bind+0xde0/0x1410 drivers/usb/gadget/configfs.c:1802 gadget_bind_driver+0x2ca/0x9e0 drivers/usb/gadget/udc/core.c:1662 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:706 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898 __driver_attach+0x339/0x600 drivers/base/dd.c:1292 bus_for_each_dev+0x23e/0x2c0 drivers/base/bus.c:383 bus_add_driver+0x348/0x670 drivers/base/bus.c:763 driver_register+0x23a/0x320 drivers/base/driver.c:174 usb_gadget_register_driver_owner+0xf9/0x270 drivers/usb/gadget/udc/core.c:1752 gadget_dev_desc_UDC_store+0x1c9/0x2f0 drivers/usb/gadget/configfs.c:300 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x33a/0x430 fs/configfs/file.c:229 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x61e/0xbb0 fs/read_write.c:687 ksys_write+0x156/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888034f78000 which belongs to the cache kmalloc-cg-8k of size 8192 The buggy address is located 2304 bytes inside of freed 8192-byte region [ffff888034f78000, ffff888034f7a000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34f78 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888034f7a011 flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff88813ff08640 dead000000000100 dead000000000122 raw: 0000000000000000 0000000300020002 00000000f5000000 ffff888034f7a011 head: 0080000000000040 ffff88813ff08640 dead000000000100 dead000000000122 head: 0000000000000000 0000000300020002 00000000f5000000 ffff888034f7a011 head: 0080000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 72, tgid 72 (kworker/u8:4), ts 112596841346 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2591/0x2600 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x230/0x5c0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kvmalloc_node_noprof+0x6f4/0x890 mm/slub.c:7015 alloc_netdev_mqs+0xa9/0x12c0 net/core/dev.c:12163 nsim_create+0x87/0x1160 drivers/net/netdevsim/netdev.c:1136 __nsim_dev_port_add+0x7f8/0xcd0 drivers/net/netdevsim/dev.c:1434 nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1495 nsim_dev_reload_create drivers/net/netdevsim/dev.c:1547 [inline] nsim_dev_reload_up+0x4dd/0x880 drivers/net/netdevsim/dev.c:983 devlink_reload+0x4bb/0x890 net/devlink/dev.c:475 devlink_pernet_pre_exit+0x1ff/0x420 net/devlink/core.c:584 ops_pre_exit_list net/core/net_namespace.c:161 [inline] ops_undo_list+0x17d/0x8d0 net/core/net_namespace.c:235 cleanup_net+0x575/0x810 net/core/net_namespace.c:706 page last free pid 5849 tgid 5849 ts 110263695073 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xf8e/0x1070 mm/page_alloc.c:2962 __slab_free+0x250/0x2a0 mm/slub.c:5823 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x360/0x690 mm/slub.c:5010 vm_area_dup+0x28/0x750 mm/vma_init.c:128 __split_vma+0x1d7/0xa00 mm/vma.c:560 vms_gather_munmap_vmas+0x322/0x1370 mm/vma.c:1507 do_vmi_align_munmap+0x2c7/0x4d0 mm/vma.c:1675 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1732 __vm_munmap+0x241/0x3e0 mm/vma.c:3415 __do_sys_munmap mm/mmap.c:1094 [inline] __se_sys_munmap mm/mmap.c:1091 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1091 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888034f78800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888034f78880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888034f78900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888034f78980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888034f78a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.