From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f80.google.com (mail-ot1-f80.google.com [209.85.210.80]) (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 742533CBE7C for ; Mon, 20 Apr 2026 21:47:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776721644; cv=none; b=WixYPiRUQEG1aQQHc2EKWc77T253X8QvxG2Tk/Ctr7YbdHcVizkeK+l0leBTR8W/V3YiDltqxw0T/nxFS3bDG9Q+RzDtk96bwp+Dkop/kN2itlib+oCggzUuSHyW7hfhSMbJGWj08B7Y07DbXHYAbDU5Fw213S66I2EfDLAaOA8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776721644; c=relaxed/simple; bh=30oTKc/cluTM7EZtRjSa/q8KkzVYmAprKF2NnyBd718=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=l5Xl2gf1+Vr1GWajex2ZdPw/PXbU3iOX1aPu841hoC3HxkO1y/UHyLag8Ez+FQlWWHsesQ8BftSGPVWkbv9zr3cL11tlPQ518LrHwYlnZC8bWNls30nU+JWhcyKm8vCTTNJm+uZExMU3oXNN3MYGVJ62TiHNW3OtibWTj8HFhIY= 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=209.85.210.80 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-f80.google.com with SMTP id 46e09a7af769-7dcc79309d0so1984929a34.1 for ; Mon, 20 Apr 2026 14:47:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776721640; x=1777326440; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=EpSebxuwISWBXtttRGllv6OThiDp0ScPrSL9/tEWrbc=; b=I642wg4T4uLcew9aWr+Q+my5+9cbkdm6Z/XcDmkipKD91xzATWyQRvdN7Ay0F1ejdm 2yDY3EzxRwgo3fJodJsThuMByKOR/jHzMqsx1G7QXhDu4krOE1nry/9p/sNeUy6SrNfu KiZEUJxSiZL48aNPH8tYRsNtoeVq7ezsJZcdHP6w0qZ2n4wDjvmf282BzSg+f8Wmgb0C n18JMNrKJS4eP1PY4X2GbMm1SQwThZ0JtGQwm5c4r8bBlphSWHLfz6hi2c1CEDpTB16R JjRPW/cZqGS4QtjPWgrUGgpjFUTk/SaT94v/QkZS4bKZto6uRR13J3vFdxUl6zuhE1DF oTRw== X-Forwarded-Encrypted: i=1; AFNElJ9KUJ1LPKUqsVr62Lku+nWXa8ZsGWX7K3MFOo29vm3KvVEgMzoY8vSJsJz/xuxQ3NjUYK2hvo+JvFd/ZWo=@vger.kernel.org X-Gm-Message-State: AOJu0YxIFWr8BXACqdle5KFnJa7PfhWBThtOvseuL6WfG+N5GOO98cH4 iwr+uyACCmju/TZgSZFmfBY0ruu8LO5UBzMjFt5DPNLhYF+npmGbp8uvQIrLaNZQg6Y3kHWvZAr ujazoA1By3yfHbp9Izya9fCb64VYYCVefsRi8sbVfeeX4r5tHwyZ0HhYSbSM= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:840e:b0:694:9224:d78e with SMTP id 006d021491bc7-6949224decfmr1023868eaf.9.1776721639860; Mon, 20 Apr 2026 14:47:19 -0700 (PDT) Date: Mon, 20 Apr 2026 14:47:19 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e69ee7.050a0220.24bfd3.002b.GAE@google.com> Subject: [syzbot] [net?] [usb?] KASAN: slab-use-after-free Read in rtl8150_start_xmit From: syzbot To: andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, petkan@nucleusys.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: c1f49dea2b8f Merge tag 'mm-hotfixes-stable-2026-04-19-00-1.. 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=158822d2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=547af2cd0df5277f dashboard link: https://syzkaller.appspot.com/bug?extid=3f46c095ac0ca048cb71 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/b0b2d34cef3a/disk-c1f49dea.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/54e06fcfd92f/vmlinux-c1f49dea.xz kernel image: https://storage.googleapis.com/syzbot-assets/0aa8d05931c2/bzImage-c1f49dea.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3f46c095ac0ca048cb71@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712 Read of size 4 at addr ffff88810eb7a930 by task kworker/0:4/5226 CPU: 0 UID: 0 PID: 5226 Comm: kworker/0:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Workqueue: mld mld_ifc_work 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/0x1d0 mm/kasan/report.c:595 rtl8150_start_xmit+0x71f/0x760 drivers/net/usb/rtl8150.c:712 __netdev_start_xmit include/linux/netdevice.h:5343 [inline] netdev_start_xmit include/linux/netdevice.h:5352 [inline] xmit_one net/core/dev.c:3888 [inline] dev_hard_start_xmit+0x128/0x7a0 net/core/dev.c:3904 sch_direct_xmit+0x194/0x890 net/sched/sch_generic.c:372 __dev_xmit_skb net/core/dev.c:4209 [inline] __dev_queue_xmit+0x278a/0x4930 net/core/dev.c:4831 dev_queue_xmit include/linux/netdevice.h:3401 [inline] neigh_resolve_output net/core/neighbour.c:1619 [inline] neigh_resolve_output+0x51d/0x8f0 net/core/neighbour.c:1599 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xa92/0x1f20 net/ipv6/ip6_output.c:136 __ip6_finish_output+0x359/0xd10 net/ipv6/ip6_output.c:208 ip6_finish_output net/ipv6/ip6_output.c:219 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x2a1/0xa50 net/ipv6/ip6_output.c:246 dst_output include/net/dst.h:470 [inline] NF_HOOK.constprop.0+0x115/0x5a0 include/linux/netfilter.h:318 mld_sendpack+0x923/0xef0 net/ipv6/mcast.c:1855 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x75a/0xc10 net/ipv6/mcast.c:2693 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 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 Allocated by task 5226: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6e/0x70 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4569 [inline] slab_alloc_node mm/slub.c:4898 [inline] kmem_cache_alloc_node_noprof+0x26b/0x6b0 mm/slub.c:4950 __alloc_skb+0x140/0x710 net/core/skbuff.c:702 alloc_skb include/linux/skbuff.h:1383 [inline] mld_newpack.isra.0+0x18e/0xa30 net/ipv6/mcast.c:1775 add_grhead+0x299/0x340 net/ipv6/mcast.c:1886 add_grec+0x139a/0x1940 net/ipv6/mcast.c:2025 mld_send_cr net/ipv6/mcast.c:2148 [inline] mld_ifc_work+0x3c5/0xc10 net/ipv6/mcast.c:2693 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3302 process_scheduled_works kernel/workqueue.c:3385 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3466 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 Freed by task 2860: 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_mempool_poison_object+0x91/0x150 mm/kasan/common.c:539 kasan_mempool_poison_object include/linux/kasan.h:363 [inline] napi_skb_cache_put+0x68/0x740 net/core/skbuff.c:1459 net_tx_action+0x2b0/0xf90 net/core/dev.c:5807 handle_softirqs+0x1dd/0x9e0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x160/0x210 kernel/softirq.c:735 irq_exit_rcu+0x9/0x30 kernel/softirq.c:752 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 The buggy address belongs to the object at ffff88810eb7a8c0 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 112 bytes inside of freed 232-byte region [ffff88810eb7a8c0, ffff88810eb7a9a8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10eb7a flags: 0x200000000000000(node=0|zone=2) page_type: f5(slab) raw: 0200000000000000 ffff888102e8c8c0 dead000000000100 dead000000000122 raw: 0000000000000000 00000008000c000c 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 2971, tgid 2971 (syz-executor), ts 110258130289, free_ts 109191008280 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x153/0x170 mm/page_alloc.c:1858 prep_new_page mm/page_alloc.c:1866 [inline] get_page_from_freelist+0xf34/0x3a90 mm/page_alloc.c:3946 __alloc_frozen_pages_noprof+0x273/0x28a0 mm/page_alloc.c:5226 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab mm/slub.c:3467 [inline] new_slab+0xa6/0x6b0 mm/slub.c:3525 refill_objects+0x277/0x420 mm/slub.c:7251 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x375/0x650 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] kmem_cache_alloc_noprof+0x520/0x6a0 mm/slub.c:4905 skb_clone+0x190/0x400 net/core/skbuff.c:2107 dev_queue_xmit_nit+0x255/0xa80 net/core/dev.c:2574 xmit_one net/core/dev.c:3884 [inline] dev_hard_start_xmit+0x2fc/0x7a0 net/core/dev.c:3904 sch_direct_xmit+0x194/0x890 net/sched/sch_generic.c:372 __dev_xmit_skb net/core/dev.c:4209 [inline] __dev_queue_xmit+0x278a/0x4930 net/core/dev.c:4831 dev_queue_xmit include/linux/netdevice.h:3401 [inline] neigh_hh_output include/net/neighbour.h:540 [inline] neigh_output include/net/neighbour.h:554 [inline] ip_finish_output2+0xea0/0x2350 net/ipv4/ip_output.c:237 __ip_finish_output.part.0+0x1b4/0x350 net/ipv4/ip_output.c:315 __ip_finish_output net/ipv4/ip_output.c:303 [inline] ip_finish_output net/ipv4/ip_output.c:325 [inline] NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x392/0xc00 net/ipv4/ip_output.c:438 dst_output include/net/dst.h:470 [inline] ip_local_out+0x193/0x1f0 net/ipv4/ip_output.c:131 page last free pid 5250 tgid 5248 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1402 [inline] __free_frozen_pages+0x692/0xf10 mm/page_alloc.c:2943 tlb_batch_list_free mm/mmu_gather.c:161 [inline] tlb_finish_mmu+0x27d/0x810 mm/mmu_gather.c:552 exit_mmap+0x454/0xa10 mm/mmap.c:1313 __mmput kernel/fork.c:1178 [inline] mmput+0xe0/0x430 kernel/fork.c:1201 exit_mm kernel/exit.c:581 [inline] do_exit+0x833/0x2a60 kernel/exit.c:963 do_group_exit+0xd5/0x2a0 kernel/exit.c:1117 get_signal+0x1ec7/0x21e0 kernel/signal.c:3037 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x7e/0x430 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline] do_syscall_64+0x682/0x7f0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88810eb7a800: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ffff88810eb7a880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88810eb7a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810eb7a980: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ffff88810eb7aa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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