From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f80.google.com (mail-oa1-f80.google.com [209.85.160.80]) (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 9E27522173A for ; Thu, 15 Jan 2026 20:15:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.80 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768508126; cv=none; b=ooC56z/Zrx9m84tc1agl/dNUB01LeKh7C4vByEnWuVe2A3vHWAj3J+9OFgzxYopj8FusbAFmKeQe+Ck7AKU43PE1sJJfW65BeKu6nrSvWtqegwpbHwuSmiig0D0kFPKHZ7lgcpNYOfXM5EsWvz9oneHGnkv0nEW9tQHCOwYmcUs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768508126; c=relaxed/simple; bh=Z5acAB17dor4Dz1aGkef3WF4HTPuYFFSnSwJpAGhP+o=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Mc2GP0IXqanwRwAW8yMZc8Q7MMdNoi4pkQKm2JSkG1u9MkTc07IiUak1uk2FsXq0wyY5r0aCu0xzxKovJRlCHppj4ilIEDB2LKHS9oWy3BnPSTiEkac8ReKV0/SRafWW8EJlSjIOy8IHMxbZegrEgQObVc/sxdF4tXShWu1GMpw= 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=209.85.160.80 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-oa1-f80.google.com with SMTP id 586e51a60fabf-4040b9ea153so2299908fac.1 for ; Thu, 15 Jan 2026 12:15:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1768508123; x=1769112923; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=KiZTjRLBlsA3Wcygqju07dmSc4w9UmIri5a110gs5xc=; b=hl2Ulze6yCusIo3KM0QVgu4pD8gUfB1emwkoH6carytPngCiIXXDtpTfJo2MtghFHk RD4dloqdnIxNEBsP40mIeZtSDz2q63JUAhocFfUtgWZNZVWwn0Ik3TXgrrsEj/RYEeAS vbqoMSzhG+pyAkogUrOeUO70VvXrHlT4sn2YuRWUyhjJu40xT9Ay7zsUE/2yPG38h3tX ohbTPqmSh5sEgtqShQ6rcjjDKSIxb0gSr4ekfL9KHqEHdrxquPlSz64AzamSLwYA1HZs uGoXrZoamQq2hid2J3Id9RGYNPAhfdpVIHrD7V2Kw/BByOsKS742CEN9+NvgwMj2HA6j Cp9g== X-Forwarded-Encrypted: i=1; AJvYcCWvVKvX55sx6Hit/TB+6koAH1bk182ApsQC29Sns1q3mFb061aPTerKoSw9ER2jRNh9oNIgImY=@vger.kernel.org X-Gm-Message-State: AOJu0Yz4dl+OPOliRyo1/BG90R4Kx+G1oF6yUO+jYEtdVNMMOgcYcbjU lpfgXN+fOYL+C3gBwYuDiEd9tbZ2i3BNjtheRZMHBOK9qwh232RyecF9IteXsysiQpcYK94bVKF YkknQ71P10j8+7/bGeieCobA6cGtg77UqnLfSpmQ7pGoMGbUbkL3XOa+gzNY= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:c93:b0:65f:6582:6b23 with SMTP id 006d021491bc7-6611898345cmr182581eaf.38.1768508123564; Thu, 15 Jan 2026 12:15:23 -0800 (PST) Date: Thu, 15 Jan 2026 12:15:23 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69694adb.050a0220.58bed.0026.GAE@google.com> Subject: [syzbot] [hams?] KASAN: slab-use-after-free Write in rose_send_frame From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-hams@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 46a51f4f5eda Merge tag 'for-v6.17-rc' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17204e42580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f5b21423ca3f0a96 dashboard link: https://syzkaller.appspot.com/bug?extid=9cc08d5dcb1fc8feee76 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e7338673c380/disk-46a51f4f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b3b702fe6d97/vmlinux-46a51f4f.xz kernel image: https://storage.googleapis.com/syzbot-assets/7c58e7a0c4c8/bzImage-46a51f4f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9cc08d5dcb1fc8feee76@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in rose_send_frame+0x131/0x220 net/rose/rose_link.c:106 Write of size 8 at addr ffff88805a57c018 by task ktimers/0/16 CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 rose_send_frame+0x131/0x220 net/rose/rose_link.c:106 rose_transmit_restart_request net/rose/rose_link.c:198 [inline] rose_t0timer_expiry+0x143/0x360 net/rose/rose_link.c:83 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x648/0x970 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x22f/0x710 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] run_ktimerd+0xcf/0x190 kernel/softirq.c:1043 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 11663: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x1a8/0x320 mm/slub.c:4407 kmalloc_noprof include/linux/slab.h:905 [inline] rose_add_node+0x26f/0xf20 net/rose/rose_route.c:85 rose_rt_ioctl+0xd74/0x1300 net/rose/rose_route.c:748 rose_ioctl+0x3ce/0x8b0 net/rose/af_rose.c:1381 sock_do_ioctl+0xdc/0x300 net/socket.c:1238 sock_ioctl+0x579/0x790 net/socket.c:1359 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 29: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2422 [inline] slab_free mm/slub.c:4695 [inline] kfree+0x195/0x550 mm/slub.c:4894 rose_neigh_put include/net/rose.h:166 [inline] rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x648/0x970 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x22f/0x710 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] run_ktimerd+0xcf/0x190 kernel/softirq.c:1043 smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88805a57c000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 24 bytes inside of freed 512-byte region [ffff88805a57c000, ffff88805a57c200) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805a57f800 pfn:0x5a57c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x80000000000240(workingset|head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000240 ffff888019841c80 ffffea0000a34c10 ffffea00008f7510 raw: ffff88805a57f800 000000000010000c 00000000f5000000 0000000000000000 head: 0080000000000240 ffff888019841c80 ffffea0000a34c10 ffffea00008f7510 head: ffff88805a57f800 000000000010000c 00000000f5000000 0000000000000000 head: 0080000000000002 ffffea0001695f01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5851, tgid 5851 (syz-executor), ts 123546082948, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x2119/0x21b0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2492 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2660 new_slab mm/slub.c:2714 [inline] ___slab_alloc+0x8d1/0xdc0 mm/slub.c:3901 __slab_alloc mm/slub.c:3992 [inline] __slab_alloc_node mm/slub.c:4067 [inline] slab_alloc_node mm/slub.c:4228 [inline] __kmalloc_cache_noprof+0xe6/0x320 mm/slub.c:4402 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] mca_alloc net/ipv6/mcast.c:876 [inline] __ipv6_dev_mc_inc+0x44f/0xa50 net/ipv6/mcast.c:966 ipv6_add_dev+0xea1/0x13c0 net/ipv6/addrconf.c:475 addrconf_notify+0x794/0x1010 net/ipv6/addrconf.c:3650 notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] register_netdevice+0x163c/0x1b10 net/core/dev.c:11244 register_vlan_dev+0x3cb/0x800 net/8021q/vlan.c:179 vlan_newlink+0x4b2/0x610 net/8021q/vlan_netlink.c:194 rtnl_newlink_create+0x310/0xb00 net/core/rtnetlink.c:3825 __rtnl_newlink net/core/rtnetlink.c:3942 [inline] rtnl_newlink+0x16d6/0x1c70 net/core/rtnetlink.c:4057 page_owner free stack trace missing Memory state around the buggy address: ffff88805a57bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805a57bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805a57c000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805a57c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a57c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. 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