From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f78.google.com (mail-io1-f78.google.com [209.85.166.78]) (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 13400202998 for ; Wed, 28 May 2025 10:02:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748426552; cv=none; b=hVdIG5gmpsFoQrNO1AiYLTD4d8kkZDizLM+f1npyi1TKEcrvSAZPERP40ETCs+4Bjy/aB59plRXZgeP6khtKB9EP1/6+ZHclVVPufxhKhOlskhjzx6IPHZZz0ZXljLecFcoptvMF+5JTI9P11SXL+CWliv/GmVgFWVKJyOw2BtA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748426552; c=relaxed/simple; bh=mkt9D7OwyebtFa4S+F0xYYNVSG6fz9Cyvyq9s35k2B8=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=WhOJoL+nLjYWWqLLsBaS3bURS1GxbBqQbCjZStmGAJ2H7a/WBR7hDNWsHADQw8bCmcFcfik+BceMjo2h5dPfbEyyNJD4O6x/J50xa/U9kViRbuyysMO6Kqhowdoqjv7QU0GRXqixSHwDST3ZWyudBA46RY1LxplNg5ebjNgMJJk= 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=209.85.166.78 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-io1-f78.google.com with SMTP id ca18e2360f4ac-85b3a6c37e2so403109039f.0 for ; Wed, 28 May 2025 03:02:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748426550; x=1749031350; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=moqIRBVigjhPUIqMmS2sg/So0AXKtSpC6g4RpSBMwwQ=; b=mNdqo+KRFQvC7tAtWqk/Gv7i8czXaiLc3v6nu9k6Ur1Flsdw+wjSJZmH84UHvnza9B h0pVwseW6bQ2rtpO80Gv/AppmoeVQqZubgKUC3Ze6IeYjqVCgCOflMe5yH34a4qJoDRc DHdTf1ac029hjYlBP4YWWgBxSxL1Kzvy5Rfyag0U9Y/DJsY9pqKutOExeT/y48fYhML4 uYLeCY32TsfKK17/JD2jfNzTLxT+rasgT3bJG3tzZFVdkiKsmADwidQL8/IJtuN/KXF8 FKDKt8QzLxhP/zLJTBZJiCPJUVFkdYRqn0eCFBTyUL4OELOula4UqdYyKB6HUFYCS8a/ vCQQ== X-Forwarded-Encrypted: i=1; AJvYcCU5Wv5AqoscQjX/bR3OGazHBVct+yQpUXMF4mveXc1po6L1kFiO921PtAdJdQQz5itXnLenZMgHNW17F3c=@vger.kernel.org X-Gm-Message-State: AOJu0YzcuYECli8V0HGf4nBJaAQTqbeY00C6lQO4Ed/QptS4hllTw1ue t5m5Xy9t9nBvIAkT7CCrG7di7+M3Bd7TAIEICFc6rJh5Go0lPav7f5rmrLfPNwb8lVCvK3WjQDM U2/5c0AC7QZt68MFzYa8M4L5Ly868Lz1E7aADoPXvqKRgbh5Aqpo9Xh2w0Hg= X-Google-Smtp-Source: AGHT+IGx2gOtTa1Qo7q+C4Ls1d6wREFiqZ6VhaHbJPwPRbJpViovQcjFkxzkhOeWcT7m1U/5bl1JSNhu64vTSkx4Mpsh3XsEhv12 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:4191:b0:867:6c90:4867 with SMTP id ca18e2360f4ac-86cbb91658cmr2089776539f.14.1748426550177; Wed, 28 May 2025 03:02:30 -0700 (PDT) Date: Wed, 28 May 2025 03:02:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6836df36.a70a0220.253bc2.00c6.GAE@google.com> Subject: [syzbot] [batman?] KASAN: slab-use-after-free Write in batadv_forw_packet_steal From: syzbot To: antonio@mandelbit.com, b.a.t.m.a.n@lists.open-mesh.org, davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, marek.lindner@mailbox.org, netdev@vger.kernel.org, pabeni@redhat.com, sven@narfation.org, sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: ebd297a2affa Merge tag 'net-6.15-rc5' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=132e89b3980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a9a25b7a36123454 dashboard link: https://syzkaller.appspot.com/bug?extid=cf67d03e10798cc088c4 compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f0ac4d2393a8/disk-ebd297a2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/377911478299/vmlinux-ebd297a2.xz kernel image: https://storage.googleapis.com/syzbot-assets/b3b681ee6d30/bzImage-ebd297a2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cf67d03e10798cc088c4@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:980 [inline] BUG: KASAN: slab-use-after-free in hlist_del_init include/linux/list.h:1008 [inline] BUG: KASAN: slab-use-after-free in batadv_forw_packet_steal+0xc9/0x170 net/batman-adv/send.c:583 Write of size 8 at addr ffff88807d60e800 by task kworker/u8:14/6252 CPU: 1 UID: 0 PID: 6252 Comm: kworker/u8:14 Not tainted 6.15.0-rc4-syzkaller-00147-gebd297a2affa #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xb4/0x290 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 __hlist_del include/linux/list.h:980 [inline] hlist_del_init include/linux/list.h:1008 [inline] batadv_forw_packet_steal+0xc9/0x170 net/batman-adv/send.c:583 batadv_iv_send_outstanding_bat_ogm_packet+0x6db/0x7e0 net/batman-adv/bat_iv_ogm.c:1724 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 52: 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:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4372 kmalloc_noprof include/linux/slab.h:905 [inline] batadv_forw_packet_alloc+0x1e9/0x390 net/batman-adv/send.c:519 batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:571 [inline] batadv_iv_ogm_queue_add+0x85f/0xd30 net/batman-adv/bat_iv_ogm.c:678 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:841 [inline] batadv_iv_ogm_schedule+0x81c/0xea0 net/batman-adv/bat_iv_ogm.c:876 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1720 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 6252: 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:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2398 [inline] slab_free mm/slub.c:4656 [inline] kfree+0x193/0x440 mm/slub.c:4855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548 insert_work+0x3d/0x330 kernel/workqueue.c:2183 __queue_work+0xbd9/0xfe0 kernel/workqueue.c:2345 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1835 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x646/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x286/0x870 kernel/softirq.c:579 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:164 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88807d60e800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 0 bytes inside of freed 512-byte region [ffff88807d60e800, ffff88807d60ea00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d60c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0001f58301 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 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 5197, tgid 5197 (udevd), ts 90749117127, free_ts 90540158601 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3872 __slab_alloc mm/slub.c:3962 [inline] __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4367 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] kernfs_fop_open+0x397/0xca0 fs/kernfs/file.c:623 do_dentry_open+0xdf3/0x1970 fs/open.c:956 vfs_open+0x3b/0x340 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x2ee5/0x3830 fs/namei.c:4039 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 15 tgid 15 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725 rcu_do_batch kernel/rcu/tree.c:2568 [inline] rcu_core+0xca8/0x1710 kernel/rcu/tree.c:2824 handle_softirqs+0x286/0x870 kernel/softirq.c:579 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:164 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4e/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88807d60e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d60e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d60e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d60e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d60e900: fb 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