================================================================== BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:764 Read of size 2 at addr ffff88806016e9fb by task syz.3.591/6462 CPU: 1 PID: 6462 Comm: syz.3.591 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:764 netdev_core_pick_tx+0x118/0x2e0 net/core/dev.c:4184 __dev_queue_xmit+0x756/0x2f80 net/core/dev.c:4261 packet_snd net/packet/af_packet.c:3089 [inline] packet_sendmsg+0x3dba/0x5060 net/packet/af_packet.c:3120 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f0ca7281819 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:00007f0ca54db028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0ca74fafa0 RCX: 00007f0ca7281819 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000005 RBP: 00007f0ca7317c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0ca74fb038 R14: 00007f0ca74fafa0 R15: 00007ffccaf0ec88 Allocated by task 4657: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x3fa/0xa90 net/ipv6/mcast.c:935 ipv6_add_dev+0xcc9/0x1190 net/ipv6/addrconf.c:464 addrconf_notify+0x66f/0xf00 net/ipv6/addrconf.c:3576 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2074 [inline] call_netdevice_notifiers net/core/dev.c:2088 [inline] register_netdevice+0x12a6/0x1710 net/core/dev.c:10454 geneve_configure+0x64b/0xa80 drivers/net/geneve.c:1443 geneve_newlink+0x103/0x1a0 drivers/net/geneve.c:1694 __rtnl_newlink net/core/rtnetlink.c:3529 [inline] rtnl_newlink+0x1359/0x1a50 net/core/rtnetlink.c:3577 rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5687 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2072 __do_sys_sendto net/socket.c:2084 [inline] __se_sys_sendto net/socket.c:2080 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2080 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88806016e800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff88806016e800, ffff88806016ea00) The buggy address belongs to the page: page:ffffea0001805b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806016d400 pfn:0x6016c head:ffffea0001805b00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e6d008 ffffea0001877408 ffff888016c41c80 raw: ffff88806016d400 000000000010000b 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3561, ts 59645309024, free_ts 59614141476 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192 __alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501 alloc_slab_page mm/slub.c:1780 [inline] allocate_slab mm/slub.c:1917 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1980 ___slab_alloc+0x80a/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3250 kmalloc include/linux/slab.h:607 [inline] kzalloc include/linux/slab.h:738 [inline] kernfs_fop_open+0x3da/0xbf0 fs/kernfs/file.c:628 do_dentry_open+0x7ff/0xf80 fs/open.c:826 do_open fs/namei.c:3616 [inline] path_openat+0x26f5/0x2fa0 fs/namei.c:3750 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396 stack_depot_save+0x418/0x440 lib/stackdepot.c:335 kasan_save_stack mm/kasan/common.c:40 [inline] kasan_set_track+0x62/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1710 [inline] slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kfree+0xef/0x2a0 mm/slub.c:4564 ip6table_mangle_table_init+0x47/0x60 net/ipv6/netfilter/ip6table_mangle.c:85 xt_find_table_lock+0x220/0x360 net/netfilter/x_tables.c:1282 xt_request_find_table_lock+0x22/0x100 net/netfilter/x_tables.c:1307 get_info net/ipv6/netfilter/ip6_tables.c:981 [inline] do_ip6t_get_ctl+0x5e8/0x1120 net/ipv6/netfilter/ip6_tables.c:1670 nf_getsockopt+0x25e/0x280 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x473/0x2470 net/ipv6/ipv6_sockglue.c:1492 tcp_getsockopt+0x200/0x25a0 net/ipv4/tcp.c:4322 __sys_getsockopt+0x1b0/0x230 net/socket.c:2256 Memory state around the buggy address: ffff88806016e880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806016e900: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806016e980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88806016ea00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806016ea80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================