From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (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 65E0F30FC11 for ; Thu, 23 Oct 2025 12:13:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761221622; cv=none; b=OMIcch83gta8Uk2wU/iaDeknKRIqir4aEkrn2OofPpg9TLzj2+vUbUhaYNxe/JDRpswS3TPOn9F5YiLAXeBkvmVP94BXRoQGY8zQHT5mFyB4KaGMlVcUa6syPTaPn0tizxM6f/evTXQt6WWNtxvHZ97V3Sfyjs8GgMwkIXkmHpU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761221622; c=relaxed/simple; bh=3OYalnmnmKwShACgYaeWJVdJA3/45vqucJoDg6xxCKc=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=GHji8U+4LV4To1YW+1SWK01U/e5ivJ1suY+HIs2pFVWOOdTmbukvK8VV0XMjogvyi9P3w5Li9lwZH712yZEQN6xGzXlBf3ZBXBFN9XXIwXlEnf5bhsAJcCfbHvJeIBo6PyeVC0JA04mhfjK4TkiKjMgVUlzl2lel8r+CqSsbHdg= 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=209.85.166.207 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-il1-f207.google.com with SMTP id e9e14a558f8ab-430d83d262fso30204165ab.2 for ; Thu, 23 Oct 2025 05:13:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1761221613; x=1761826413; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=eMiZfwr32apJwYZ0mK2NrZ0bAlrXvUhOwPNa+z4KCVk=; b=txi1+JmAUu1o3gfu7xPV3FT1s3XP+tNjivKh7bpLS/h7j92Y5qBL4xhHvxkCvmLYBc CMCTta4Fx1uyDw3Hy0Z6BZ5/9EZG+ERJF2cahj69dXejPf7vC/vJD8wN5Cch/pv4eS1E IfvAHDqDXdd1ZGsszKadNgnYtx/h4vgV1OhYIKDPf1lsd4e9DVLhPGucQLO+GkhFE2Ge lsLEGZG9FL4CN5f1i8NfHHY8pPdV0sbRN9mM5Fg4NVLrHEu4f9rRoU5srSB/ArRGfkrJ 8xbhuJ5H4v0qHvNj3Y82GdMUmqERGwZ1QqJ1suO051sVAonhADM0q9MpIRUy2tECKYWP kPsQ== X-Forwarded-Encrypted: i=1; AJvYcCXLOKNIzuSdCkNmgnw/joUbeiiIcFqvN9dOMGkaznlzz8Z7h3wlzgikW57Jv+xlaglrlJbkBw8=@vger.kernel.org X-Gm-Message-State: AOJu0YzLmV5CH+rTwepRKcBTpXjTjlY/oqvYQJmsRhvsThn3/tt67Xv7 2G3nzhWBimiEUywyBDggcrtrBU++6Gxd7tWMTq9gZjtl1KAwTgl8mxpnLDJHBtkktuYi5uUIk7N DmNcxKWU2DETMkzHsn2jJknF7lsRZ6P6ymJdxaZJXVTgQSFlzZtllwlaXDiw= X-Google-Smtp-Source: AGHT+IG1eho+3d8N6tgVB3Q7FcdfCNix3RhE4k7Y3EXmYf3pNJHOETKhkDyn7aCRphZU4/EAps6qnrQp5IfNxVLuwwWk1tOT1dbW Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1fca:b0:42f:946f:8eb4 with SMTP id e9e14a558f8ab-430c527bca5mr309055585ab.21.1761221612752; Thu, 23 Oct 2025 05:13:32 -0700 (PDT) Date: Thu, 23 Oct 2025 05:13:32 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68fa1bec.a70a0220.3bf6c6.004f.GAE@google.com> Subject: [syzbot] [hams?] KASAN: slab-use-after-free Read in ax25_find_cb From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, jreuter@yaina.de, 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: 250a17e8f955 Merge tag 'erofs-for-6.18-rc3-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=154a3734580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d1ce99afe6f71855 dashboard link: https://syzkaller.appspot.com/bug?extid=caa052a0958a9146870d compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f51301069523/disk-250a17e8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a4671c3f2507/vmlinux-250a17e8.xz kernel image: https://storage.googleapis.com/syzbot-assets/2b5a3b36a321/bzImage-250a17e8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+caa052a0958a9146870d@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in ax25_find_cb+0x3b8/0x3f0 net/ax25/af_ax25.c:237 Read of size 1 at addr ffff888059c704c0 by task syz.6.2733/17200 CPU: 1 UID: 0 PID: 17200 Comm: syz.6.2733 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 ax25_find_cb+0x3b8/0x3f0 net/ax25/af_ax25.c:237 ax25_send_frame+0x157/0xb60 net/ax25/ax25_out.c:55 rose_send_frame+0xcc/0x2c0 net/rose/rose_link.c:106 rose_transmit_restart_request+0x1b8/0x240 net/rose/rose_link.c:198 rose_t0timer_expiry+0x1d/0x150 net/rose/rose_link.c:83 call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers+0x6ef/0x960 kernel/time/timer.c:2372 __run_timer_base kernel/time/timer.c:2384 [inline] __run_timer_base kernel/time/timer.c:2376 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2393 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7fd4a4c68253 Code: 1f 84 00 00 00 00 00 48 8b 70 f8 48 83 e8 08 48 39 f2 72 f3 48 39 c3 73 3e 48 89 33 48 83 c3 08 48 8b 70 f8 48 89 08 48 8b 0b <49> 8b 14 24 eb bf 48 39 f2 72 97 48 39 f0 73 46 49 89 34 24 48 89 RSP: 002b:00007ffd914df840 EFLAGS: 00000212 RAX: 00007fd4a4777648 RBX: 00007fd4a47774b0 RCX: ffffffff8a01d69a RDX: ffffffff8a01d69a RSI: ffffffff8a01d69a RDI: 00007fd4a47777a0 RBP: 00007fd4a4777358 R08: 00007fd4a4777578 R09: 00007fd4a4fd2000 R10: 00007fd4a43fd008 R11: 000000000000000a R12: 00007fd4a4777350 R13: 0000000000000016 R14: 00007ffd914dfab8 R15: 00007fd4a43fd008 Allocated by task 13773: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:400 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417 kmalloc_noprof include/linux/slab.h:957 [inline] rose_add_node net/rose/rose_route.c:109 [inline] rose_rt_ioctl+0x1c40/0x2580 net/rose/rose_route.c:748 rose_ioctl+0x64d/0x7c0 net/rose/af_rose.c:1381 sock_do_ioctl+0x118/0x280 net/socket.c:1254 sock_ioctl+0x227/0x6b0 net/socket.c:1375 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+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 17183: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 __kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2530 [inline] slab_free mm/slub.c:6619 [inline] kfree+0x2b8/0x6d0 mm/slub.c:6826 rose_neigh_put include/net/rose.h:165 [inline] rose_timer_expiry+0x537/0x630 net/rose/rose_timer.c:183 call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers+0x6ef/0x960 kernel/time/timer.c:2372 __run_timer_base kernel/time/timer.c:2384 [inline] __run_timer_base kernel/time/timer.c:2376 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2393 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403 handle_softirqs+0x219/0x8e0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 The buggy address belongs to the object at ffff888059c70480 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of freed 96-byte region [ffff888059c70480, ffff888059c704e0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888059c70b00 pfn:0x59c70 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88813ffa6280 ffffea0001df33d0 ffffea0000c94410 raw: ffff888059c70b00 000000000020001f 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5815, tgid 5815 (syz-executor), ts 66851059499, free_ts 66850862508 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3046 [inline] allocate_slab mm/slub.c:3219 [inline] new_slab+0x24a/0x360 mm/slub.c:3273 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4643 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4762 __slab_alloc_node mm/slub.c:4838 [inline] slab_alloc_node mm/slub.c:5260 [inline] __kmalloc_cache_noprof+0x477/0x780 mm/slub.c:5750 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] class_dir_create_and_add drivers/base/core.c:3223 [inline] get_device_parent+0x2b1/0x4e0 drivers/base/core.c:3283 device_add+0x1ad/0x1aa0 drivers/base/core.c:3613 netdev_register_kobject+0x1a9/0x3d0 net/core/net-sysfs.c:2358 register_netdevice+0x13dc/0x2270 net/core/dev.c:11294 cfg80211_register_netdevice+0x149/0x340 net/wireless/core.c:1518 ieee80211_if_add+0xc9d/0x1a40 net/mac80211/iface.c:2295 ieee80211_register_hw+0x393b/0x4120 net/mac80211/main.c:1608 mac80211_hwsim_new_radio+0x32d8/0x50b0 drivers/net/wireless/virtual/mac80211_hwsim.c:5803 page last free pid 5815 tgid 5815 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0x7df/0x1160 mm/page_alloc.c:2906 selinux_genfs_get_sid security/selinux/hooks.c:1357 [inline] inode_doinit_with_dentry+0xacb/0x12e0 security/selinux/hooks.c:1555 selinux_d_instantiate+0x26/0x30 security/selinux/hooks.c:6523 security_d_instantiate+0x142/0x1a0 security/security.c:4148 d_instantiate+0x5c/0x90 fs/dcache.c:1961 __debugfs_create_file+0x286/0x6b0 fs/debugfs/inode.c:459 debugfs_create_file_short+0x41/0x60 fs/debugfs/inode.c:480 add_link_files+0xff/0x120 net/mac80211/debugfs_netdev.c:990 ieee80211_debugfs_add_netdev net/mac80211/debugfs_netdev.c:1011 [inline] ieee80211_debugfs_recreate_netdev+0xf70/0x17e0 net/mac80211/debugfs_netdev.c:1033 ieee80211_if_add+0x9b9/0x1a40 net/mac80211/iface.c:2269 ieee80211_register_hw+0x393b/0x4120 net/mac80211/main.c:1608 mac80211_hwsim_new_radio+0x32d8/0x50b0 drivers/net/wireless/virtual/mac80211_hwsim.c:5803 hwsim_new_radio_nl+0xba2/0x1330 drivers/net/wireless/virtual/mac80211_hwsim.c:6497 genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 Memory state around the buggy address: ffff888059c70380: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff888059c70400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff888059c70480: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888059c70500: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff888059c70580: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc 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