================================================================== BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909 Read of size 2 at addr ffff0000f566c1fb by task syz.6.1641/9904 CPU: 1 PID: 9904 Comm: syz.6.1641 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349 ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909 netdev_core_pick_tx+0x130/0x320 net/core/dev.c:4245 __dev_queue_xmit+0x738/0x3118 net/core/dev.c:4331 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3051 packet_snd net/packet/af_packet.c:3127 [inline] packet_sendmsg+0x2f9c/0x3fd0 net/packet/af_packet.c:3158 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518 ___sys_sendmsg net/socket.c:2572 [inline] __sys_sendmsg+0x288/0x374 net/socket.c:2601 __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg net/socket.c:2608 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2608 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 9067: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] pskb_expand_head+0x190/0x1030 net/core/skbuff.c:1849 skb_ensure_writable+0x248/0x3a8 net/core/skbuff.c:5796 __bpf_try_make_writable net/core/filter.c:1674 [inline] bpf_try_make_writable net/core/filter.c:1680 [inline] bpf_try_make_head_writable net/core/filter.c:1688 [inline] ____bpf_clone_redirect net/core/filter.c:2467 [inline] bpf_clone_redirect+0x194/0x3fc net/core/filter.c:2436 0xffff80002085153c bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_test_run+0x298/0x84c net/bpf/test_run.c:402 bpf_prog_test_run_skb+0xa30/0x138c net/bpf/test_run.c:1222 bpf_prog_test_run+0x2dc/0x360 kernel/bpf/syscall.c:3695 __sys_bpf+0x504/0x660 kernel/bpf/syscall.c:5049 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline] __se_sys_bpf kernel/bpf/syscall.c:5133 [inline] __arm64_sys_bpf+0x80/0x98 kernel/bpf/syscall.c:5133 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:46 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0x100/0x94c kernel/rcu/tree.c:2849 fib6_info_release include/net/ip6_fib.h:340 [inline] fib6_del_route net/ipv6/ip6_fib.c:2005 [inline] fib6_del+0xda0/0x11bc net/ipv6/ip6_fib.c:2038 fib6_clean_node+0x22c/0x4b0 net/ipv6/ip6_fib.c:2200 fib6_walk_continue+0x654/0x878 net/ipv6/ip6_fib.c:2122 fib6_walk+0x140/0x254 net/ipv6/ip6_fib.c:2170 fib6_clean_tree net/ipv6/ip6_fib.c:2250 [inline] __fib6_clean_all+0x1f4/0x334 net/ipv6/ip6_fib.c:2266 fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2277 rt6_sync_down_dev net/ipv6/route.c:4943 [inline] rt6_disable_ip+0x108/0x7cc net/ipv6/route.c:4948 addrconf_ifdown+0x148/0x15ec net/ipv6/addrconf.c:3798 addrconf_notify+0x340/0xc8c net/ipv6/addrconf.c:-1 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd4/0x164 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:2014 [inline] call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] __dev_notify_flags+0x1fc/0x490 net/core/dev.c:8717 dev_change_flags+0xd0/0x15c net/core/dev.c:8753 do_setlink+0xa5c/0x3434 net/core/rtnetlink.c:2837 __rtnl_newlink net/core/rtnetlink.c:3614 [inline] rtnl_newlink+0x13c8/0x1a54 net/core/rtnetlink.c:3661 rtnetlink_rcv_msg+0x698/0xcdc net/core/rtnetlink.c:6158 netlink_rcv_skb+0x218/0x3e8 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6176 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x60c/0x814 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6f4/0x9c0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518 ___sys_sendmsg net/socket.c:2572 [inline] __sys_sendmsg+0x288/0x374 net/socket.c:2601 __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg net/socket.c:2608 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2608 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000f566c000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff0000f566c000, ffff0000f566c200) The buggy address belongs to the physical page: page:00000000faeedc66 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f566e400 pfn:0x13566c head:00000000faeedc66 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc0003d58e08 ffff0000c0000448 ffff0000c0002600 raw: ffff0000f566e400 0000000000100002 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f566c080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f566c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f566c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f566c200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f566c280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================