================================================================== BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:764 Read of size 2 at addr ffff88802c272dfb by task syz.1.1774/9911 CPU: 1 PID: 9911 Comm: syz.1.1774 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x12c/0x300 net/core/dev.c:4184 __dev_queue_xmit+0x797/0x2e50 net/core/dev.c:4261 packet_snd net/packet/af_packet.c:3094 [inline] packet_sendmsg+0x3cf9/0x50b0 net/packet/af_packet.c:3125 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500 __sys_sendmsg net/socket.c:2529 [inline] __do_sys_sendmsg net/socket.c:2538 [inline] __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536 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: 0033:0x7f199ab74e59 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:00007f1998dce028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f199adedfa0 RCX: 00007f199ab74e59 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007f199ac0ae6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f199adee038 R14: 00007f199adedfa0 R15: 00007ffd45b771a8 Allocated by task 9785: 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+0xaf/0xe0 mm/kasan/common.c:522 kmalloc_node include/linux/slab.h:630 [inline] kvmalloc_node+0x84/0x130 mm/util.c:619 kvmalloc include/linux/mm.h:816 [inline] kvmalloc_array include/linux/mm.h:834 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x109/0x6a0 net/sched/sch_generic.c:809 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:960 mq_init+0x2c4/0x650 net/sched/sch_mq.c:90 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:960 attach_default_qdiscs net/sched/sch_generic.c:1139 [inline] dev_activate+0x192/0x1330 net/sched/sch_generic.c:1193 __dev_open+0x33b/0x430 net/core/dev.c:1559 __dev_change_flags+0x1e4/0x6a0 net/core/dev.c:8879 dev_change_flags+0x78/0x1a0 net/core/dev.c:8950 dev_ifsioc+0x130/0xd50 net/core/dev_ioctl.c:324 dev_ioctl+0x545/0xe30 net/core/dev_ioctl.c:572 sock_do_ioctl+0x245/0x320 net/socket.c:1162 sock_ioctl+0x48a/0x700 net/socket.c:1267 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 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 Freed by task 9784: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/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+0xec/0x170 mm/slub.c:1736 slab_free mm/slub.c:3504 [inline] kfree+0xef/0x2a0 mm/slub.c:4564 ptr_ring_cleanup include/linux/ptr_ring.h:671 [inline] pfifo_fast_destroy+0x49/0xd0 net/sched/sch_generic.c:835 qdisc_destroy+0x115/0x390 net/sched/sch_generic.c:1028 qdisc_put net/sched/sch_generic.c:1047 [inline] shutdown_scheduler_queue net/sched/sch_generic.c:1100 [inline] netdev_for_each_tx_queue include/linux/netdevice.h:2388 [inline] dev_shutdown+0x19e/0x700 net/sched/sch_generic.c:1408 unregister_netdevice_many+0xa59/0x1a40 net/core/dev.c:11153 unregister_netdevice_queue+0x2e1/0x320 net/core/dev.c:11093 unregister_netdevice include/linux/netdevice.h:3029 [inline] __tun_detach+0xdb7/0x1580 drivers/net/tun.c:686 tun_detach drivers/net/tun.c:702 [inline] tun_chr_close+0x109/0x1b0 drivers/net/tun.c:3443 __fput+0x212/0x8c0 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88802c272000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3579 bytes inside of 4096-byte region [ffff88802c272000, ffff88802c273000) The buggy address belongs to the page: page:ffffea0000b09c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2c270 head:ffffea0000b09c00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888016c42140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9785, ts 188072645968, free_ts 187986029250 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x24f6/0x2670 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+0x807/0xdd0 mm/slub.c:3013 __slab_alloc mm/slub.c:3100 [inline] slab_alloc_node mm/slub.c:3191 [inline] __kmalloc_node+0x142/0x3a0 mm/slub.c:4456 kmalloc_node include/linux/slab.h:630 [inline] kvmalloc_node+0x84/0x130 mm/util.c:619 kvmalloc include/linux/mm.h:816 [inline] kvmalloc_array include/linux/mm.h:834 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:471 [inline] ptr_ring_init include/linux/ptr_ring.h:489 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x35f/0x6a0 net/sched/sch_generic.c:809 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:960 mq_init+0x2c4/0x650 net/sched/sch_mq.c:90 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:960 attach_default_qdiscs net/sched/sch_generic.c:1139 [inline] dev_activate+0x192/0x1330 net/sched/sch_generic.c:1193 __dev_open+0x33b/0x430 net/core/dev.c:1559 __dev_change_flags+0x1e4/0x6a0 net/core/dev.c:8879 dev_change_flags+0x78/0x1a0 net/core/dev.c:8950 dev_ifsioc+0x130/0xd50 net/core/dev_ioctl.c:324 dev_ioctl+0x545/0xe30 net/core/dev_ioctl.c:572 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 free_slab mm/slub.c:2020 [inline] discard_slab mm/slub.c:2026 [inline] __unfreeze_partials+0x188/0x1e0 mm/slub.c:2512 put_cpu_partial+0x12d/0x190 mm/slub.c:2592 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3225 [inline] slab_alloc mm/slub.c:3233 [inline] kmem_cache_alloc+0x15d/0x280 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] lsm_file_alloc security/security.c:575 [inline] security_file_alloc+0x30/0x110 security/security.c:1531 __alloc_file+0xc2/0x240 fs/file_table.c:137 alloc_empty_file+0x90/0x180 fs/file_table.c:181 path_openat+0x11c/0x2fb0 fs/namei.c:3736 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 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 Memory state around the buggy address: ffff88802c272c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802c272d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802c272d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802c272e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802c272e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================