From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) (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 8EDF929A30D for ; Tue, 12 Aug 2025 09:11:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754989867; cv=none; b=jQzrsocC8h8aNPs1RHZceGOhZBstITkDAau/jV5mkJyjvr2RW2w3MC9XbwkBT6j5rkE4EK/vM0Ye49q4cATKY2ou/Dmbu78ApxHUSrLA2d3OEOQKTQe72bcc67HgJpUPRtPcxSLV917baJVoMMmFn2w76x/1L+WkSwipnbwxdTU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754989867; c=relaxed/simple; bh=ifv0zE5sxtvySkgzaTrelNEntX41ue4og3c8GVEqjvs=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a6b:e703:0:b0:876:1c5e:8c50 with SMTP id ca18e2360f4ac-8841beab0b8mr399095739f.7.1754989864760; Tue, 12 Aug 2025 02:11:04 -0700 (PDT) Date: Tue, 12 Aug 2025 02:11:04 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <689b0528.050a0220.51d73.00aa.GAE@google.com> Subject: Re: [syzbot] [wireless?] KASAN: slab-use-after-free Read in cmp_bss From: syzbot To: dmantipov@yandex.ru, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: KASAN: slab-use-after-free Read in cmp_bss ================================================================== BUG: KASAN: slab-use-after-free in cmp_bss+0xd4d/0xe80 net/wireless/scan.c:1504 Read of size 4 at addr ffff888000e6e898 by task kworker/u4:0/12 CPU: 0 UID: 0 PID: 12 Comm: kworker/u4:0 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498-dirty #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events_unbound cfg80211_wiphy_work 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 cmp_bss+0xd4d/0xe80 net/wireless/scan.c:1504 rb_find_bss net/wireless/scan.c:1693 [inline] __cfg80211_bss_update+0xd6/0x2140 net/wireless/scan.c:1982 cfg80211_inform_single_bss_data+0xba9/0x1ac0 net/wireless/scan.c:2377 cfg80211_inform_bss_data+0x1fb/0x3b30 net/wireless/scan.c:3236 cfg80211_inform_bss_frame_data+0x3d7/0x730 net/wireless/scan.c:3327 ieee80211_bss_info_update+0x746/0x9e0 net/mac80211/scan.c:226 ieee80211_rx_bss_info+0x176/0x280 net/mac80211/mlme.c:6564 ieee80211_rx_mgmt_probe_resp net/mac80211/mlme.c:6607 [inline] ieee80211_sta_rx_queued_mgmt+0x1294/0x4470 net/mac80211/mlme.c:8089 ieee80211_iface_process_skb net/mac80211/iface.c:1696 [inline] ieee80211_iface_work+0x652/0x12d0 net/mac80211/iface.c:1753 cfg80211_wiphy_work+0x2b8/0x470 net/wireless/core.c:435 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 3109: 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] __do_kmalloc_node mm/slub.c:4365 [inline] __kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] cfg80211_inform_single_bss_data+0x905/0x1ac0 net/wireless/scan.c:2353 cfg80211_inform_bss_data+0x1fb/0x3b30 net/wireless/scan.c:3236 cfg80211_inform_bss_frame_data+0x3d7/0x730 net/wireless/scan.c:3327 ieee80211_bss_info_update+0x746/0x9e0 net/mac80211/scan.c:226 ieee80211_rx_bss_info+0x176/0x280 net/mac80211/mlme.c:6564 ieee80211_rx_mgmt_beacon+0x197d/0x2cd0 net/mac80211/mlme.c:7513 ieee80211_sta_rx_queued_mgmt+0x4ed/0x4470 net/mac80211/mlme.c:8085 ieee80211_iface_process_skb net/mac80211/iface.c:1696 [inline] ieee80211_iface_work+0x652/0x12d0 net/mac80211/iface.c:1753 cfg80211_wiphy_work+0x2b8/0x470 net/wireless/core.c:435 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 3109: 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:2417 [inline] slab_free_freelist_hook mm/slub.c:2446 [inline] slab_free_bulk mm/slub.c:4704 [inline] kmem_cache_free_bulk+0x2d1/0x520 mm/slub.c:5283 kfree_bulk include/linux/slab.h:794 [inline] kvfree_rcu_bulk+0xe5/0x1f0 mm/slab_common.c:1516 kvfree_rcu_drain_ready mm/slab_common.c:1699 [inline] kfree_rcu_monitor+0x211/0x2a0 mm/slab_common.c:1772 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 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+0xbd/0xd0 mm/kasan/generic.c:548 kvfree_call_rcu+0xbb/0x410 mm/slab_common.c:1962 cfg80211_update_known_bss+0x9e8/0x13d0 net/wireless/scan.c:1921 cfg80211_update_assoc_bss_entry+0x4ba/0x6a0 net/wireless/scan.c:3456 cfg80211_ch_switch_notify+0x3c1/0x780 net/wireless/nl80211.c:20398 ieee80211_sta_process_chanswitch+0xad4/0x2870 net/mac80211/mlme.c:-1 ieee80211_rx_mgmt_beacon+0x19c7/0x2cd0 net/mac80211/mlme.c:7515 ieee80211_sta_rx_queued_mgmt+0x4ed/0x4470 net/mac80211/mlme.c:8085 ieee80211_iface_process_skb net/mac80211/iface.c:1696 [inline] ieee80211_iface_work+0x652/0x12d0 net/mac80211/iface.c:1753 cfg80211_wiphy_work+0x2b8/0x470 net/wireless/core.c:435 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 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 ffff888000e6e880 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 24 bytes inside of freed 96-byte region [ffff888000e6e880, ffff888000e6e8e0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xe6e flags: 0x7ff00000000000(node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 007ff00000000000 ffff88801a441280 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000200020 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 3109, tgid 3109 (kworker/u4:11), ts 107292613223, free_ts 31900007900 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+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_slab_page mm/slub.c:2489 [inline] allocate_slab+0x65/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_node_noprof+0x2fd/0x4e0 mm/slub.c:4371 kmalloc_array_node_noprof include/linux/slab.h:1020 [inline] alloc_slab_obj_exts mm/slub.c:2028 [inline] account_slab mm/slub.c:2614 [inline] allocate_slab+0x16a/0x370 mm/slub.c:2674 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4236 dst_alloc+0x105/0x170 net/core/dst.c:89 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x420 net/ipv6/route.c:3324 mld_sendpack+0x678/0xd80 net/ipv6/mcast.c:1849 ipv6_mc_dad_complete+0x88/0x410 net/ipv6/mcast.c:2284 addrconf_dad_completed+0x6d5/0xd60 net/ipv6/addrconf.c:4340 addrconf_dad_work+0xc36/0x14b0 net/ipv6/addrconf.c:-1 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 page last free pid 4756 tgid 4756 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xca8/0x1770 kernel/rcu/tree.c:2861 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Memory state around the buggy address: ffff888000e6e780: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ffff888000e6e800: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff888000e6e880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888000e6e900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888000e6e980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ================================================================== Tested on: commit: 53e760d8 Merge tag 'nfsd-6.17-1' of git://git.kernel.o.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=10c54af0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d67d3af29f50297e dashboard link: https://syzkaller.appspot.com/bug?extid=30754ca335e6fb7e3092 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 patch: https://syzkaller.appspot.com/x/patch.diff?x=15ffe5a2580000