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006d021491bc7-662f2015d78mr3259790eaf.10.1769613842765; Wed, 28 Jan 2026 07:24:02 -0800 (PST) Date: Wed, 28 Jan 2026 07:24:02 -0800 In-Reply-To: <20260128145406.42379-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <697a2a12.a70a0220.9914.0001.GAE@google.com> Subject: Re: [syzbot] [netfilter?] KASAN: slab-use-after-free Read in nft_array_get_cmp From: syzbot To: kartikey406@gmail.com, 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 nft_array_get_cmp ================================================================== BUG: KASAN: slab-use-after-free in nft_set_ext include/net/netfilter/nf_tables.h:795 [inline] BUG: KASAN: slab-use-after-free in nft_set_ext_key include/net/netfilter/nf_tables.h:800 [inline] BUG: KASAN: slab-use-after-free in nft_array_get_cmp+0x1f6/0x2a0 net/netfilter/nft_set_rbtree.c:133 Read of size 1 at addr ffff888028356599 by task syz.4.61/6804 CPU: 0 UID: 0 PID: 6804 Comm: syz.4.61 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xba/0x230 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 nft_set_ext include/net/netfilter/nf_tables.h:795 [inline] nft_set_ext_key include/net/netfilter/nf_tables.h:800 [inline] nft_array_get_cmp+0x1f6/0x2a0 net/netfilter/nft_set_rbtree.c:133 __inline_bsearch include/linux/bsearch.h:15 [inline] bsearch+0x50/0xc0 lib/bsearch.c:33 nft_rbtree_get+0x16b/0x400 net/netfilter/nft_set_rbtree.c:169 nft_setelem_get net/netfilter/nf_tables_api.c:6495 [inline] nft_get_set_elem+0x420/0xaa0 net/netfilter/nf_tables_api.c:6543 nf_tables_getsetelem+0x5c3/0x7c0 net/netfilter/nf_tables_api.c:6633 nfnetlink_rcv_msg+0x8ae/0x12c0 net/netfilter/nfnetlink.c:290 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x2c0/0x27b0 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f908c99aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f908d8ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f908cc16090 RCX: 00007f908c99aeb9 RDX: 0000000000008000 RSI: 0000200000000100 RDI: 0000000000000004 RBP: 00007f908ca08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f908cc16128 R14: 00007f908cc16090 R15: 00007ffcbdac0cb8 Allocated by task 6799: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x40c/0x7e0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] nft_set_elem_init+0xa8/0x7e0 net/netfilter/nf_tables_api.c:6813 nft_add_set_elem net/netfilter/nf_tables_api.c:7549 [inline] nf_tables_newsetelem+0x22a4/0x4360 net/netfilter/nf_tables_api.c:7719 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:526 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:649 [inline] nfnetlink_rcv+0x1240/0x27b0 net/netfilter/nfnetlink.c:667 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6801: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6674 [inline] kfree+0x1be/0x650 mm/slub.c:6882 nf_tables_set_elem_destroy net/netfilter/nf_tables_api.c:6932 [inline] nft_trans_gc_trans_free+0x519/0x6c0 net/netfilter/nf_tables_api.c:10544 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xc9e/0x1750 kernel/rcu/tree.c:2857 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 The buggy address belongs to the object at ffff888028356580 which belongs to the cache kmalloc-cg-64 of size 64 The buggy address is located 25 bytes inside of freed 64-byte region [ffff888028356580, ffff8880283565c0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888028356a80 pfn:0x28356 memcg:ffff88807aeee201 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88813fe2ec80 ffffea00017ab380 dead000000000004 raw: ffff888028356a80 000000008020001f 00000000f5000000 ffff88807aeee201 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 5895, tgid 5895 (syz-executor), ts 83082785285, free_ts 83057629143 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3a0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xd82/0x1760 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kvmalloc_node_noprof+0x673/0x8d0 mm/slub.c:7140 allocate_hook_entries_size net/netfilter/core.c:58 [inline] nf_hook_entries_grow+0x288/0x720 net/netfilter/core.c:137 __nf_register_net_hook+0x2c9/0x930 net/netfilter/core.c:432 nf_register_net_hook+0xb2/0x190 net/netfilter/core.c:575 nf_register_net_hooks+0x44/0x1b0 net/netfilter/core.c:591 ip6t_register_table+0x561/0x800 net/ipv6/netfilter/ip6_tables.c:1787 ip6table_filter_table_init+0x75/0xb0 net/ipv6/netfilter/ip6table_filter.c:48 xt_find_table_lock+0x30c/0x3e0 net/netfilter/x_tables.c:1260 xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1285 page last free pid 23 tgid 23 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xbf8/0xd70 mm/page_alloc.c:2973 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xc9e/0x1750 kernel/rcu/tree.c:2857 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Memory state around the buggy address: ffff888028356480: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888028356500: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888028356580: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888028356600: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff888028356680: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ================================================================== Tested on: commit: 239f09e2 selftests: ptp: treat unsupported PHC operati.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main console output: https://syzkaller.appspot.com/x/log.txt?x=17b4f05a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=aeae47237b696a30 dashboard link: https://syzkaller.appspot.com/bug?extid=d417922a3e7935517ef6 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=1432ebfa580000