================================================================== BUG: KASAN: slab-out-of-bounds in is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] BUG: KASAN: slab-out-of-bounds in tc_setup_flow_action+0x88e/0x3160 net/sched/cls_api.c:3640 Read of size 8 at addr ffff8881261e4cd8 by task syz.1.417/1807 CPU: 1 PID: 1807 Comm: syz.1.417 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] tc_setup_flow_action+0x88e/0x3160 net/sched/cls_api.c:3640 mall_replace_hw_filter+0x2db/0x8c0 net/sched/cls_matchall.c:100 mall_change+0x546/0x770 net/sched/cls_matchall.c:236 tc_new_tfilter+0x1487/0x1ab0 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x811/0xca0 net/core/rtnetlink.c:5613 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5640 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431 __sys_sendmsg net/socket.c:2460 [inline] __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fde18f79159 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:00007fde179d2028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fde19200fa0 RCX: 00007fde18f79159 RDX: 0000000000000000 RSI: 0000200000000180 RDI: 0000000000000004 RBP: 00007fde19010024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fde19201038 R14: 00007fde19200fa0 R15: 00007ffe1250faf8 Allocated by task 1807: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x19f/0x330 mm/slub.c:4038 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [inline] tcf_idr_create+0x5f/0x790 net/sched/act_api.c:425 tcf_idr_create_from_flags+0x61/0x70 net/sched/act_api.c:483 tcf_gact_init+0x2e6/0x560 net/sched/act_gact.c:107 tcf_action_init_1+0x443/0x6d0 net/sched/act_api.c:1047 tcf_action_init+0x227/0x780 net/sched/act_api.c:1104 tcf_exts_validate+0x23c/0x540 net/sched/cls_api.c:3087 mall_set_parms+0x4a/0x450 net/sched/cls_matchall.c:171 mall_change+0x47a/0x770 net/sched/cls_matchall.c:230 tc_new_tfilter+0x1487/0x1ab0 net/sched/cls_api.c:2134 rtnetlink_rcv_msg+0x811/0xca0 net/core/rtnetlink.c:5613 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2508 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5640 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x86c/0xa30 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x949/0xb70 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431 __sys_sendmsg net/socket.c:2460 [inline] __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881261e4c00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 216 bytes inside of 256-byte region [ffff8881261e4c00, ffff8881261e4d00) The buggy address belongs to the page: page:ffffea0004987900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1261e4 head:ffffea0004987900 order:1 compound_mapcount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 0000000000000000 0000000100000001 ffff888100043200 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 280, ts 23385004170, free_ts 23384336387 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] __kmalloc+0x1f9/0x330 mm/slub.c:4034 kmalloc include/linux/slab.h:560 [inline] kzalloc include/linux/slab.h:667 [inline] fib_create_info+0x8eb/0x1ed0 net/ipv4/fib_semantics.c:1508 fib_table_insert+0xc2/0x1d60 net/ipv4/fib_trie.c:1170 fib_magic net/ipv4/fib_frontend.c:1107 [inline] fib_add_ifaddr+0x892/0xf90 net/ipv4/fib_frontend.c:1144 fib_netdev_event+0x22e/0x5b0 net/ipv4/fib_frontend.c:1491 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2052 [inline] call_netdevice_notifiers_extack net/core/dev.c:2064 [inline] call_netdevice_notifiers net/core/dev.c:2078 [inline] __dev_notify_flags+0x2f4/0x5b0 net/core/dev.c:8583 dev_change_flags+0xe3/0x1a0 net/core/dev.c:8621 do_setlink+0xb19/0x29a0 net/core/rtnetlink.c:2744 __rtnl_newlink net/core/rtnetlink.c:3422 [inline] rtnl_newlink+0x13e6/0x1830 net/core/rtnetlink.c:3542 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x390 mm/page_alloc.c:5454 free_pages+0x82/0x90 mm/page_alloc.c:5465 __stack_depot_save+0x492/0x4c0 lib/stackdepot.c:359 kasan_save_stack mm/kasan/common.c:39 [inline] kasan_set_track+0x5b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kmem_cache_free+0x100/0x2d0 mm/slub.c:3224 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1 __kfree_skb net/core/skbuff.c:695 [inline] consume_skb+0xb3/0x1f0 net/core/skbuff.c:851 netlink_broadcast_filtered+0x11ce/0x12c0 net/netlink/af_netlink.c:1535 netlink_broadcast net/netlink/af_netlink.c:1557 [inline] nlmsg_multicast include/net/netlink.h:1033 [inline] nlmsg_notify+0xe9/0x1a0 net/netlink/af_netlink.c:2551 rtnl_notify net/core/rtnetlink.c:740 [inline] rtmsg_ifinfo_send net/core/rtnetlink.c:3880 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:3895 [inline] rtnetlink_event+0x13a/0x1a0 net/core/rtnetlink.c:5673 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410 Memory state around the buggy address: ffff8881261e4b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881261e4c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881261e4c80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ^ ffff8881261e4d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881261e4d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================