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BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:909
Read of size 2 at addr ffff8880590379fb by task syz.5.469/6343

CPU: 0 PID: 6343 Comm: syz.5.469 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:909
 netdev_core_pick_tx+0x118/0x340 net/core/dev.c:4233
 __dev_queue_xmit+0xb19/0x37c0 net/core/dev.c:4319
 packet_snd net/packet/af_packet.c:3127 [inline]
 packet_sendmsg+0x3bc3/0x4e60 net/packet/af_packet.c:3158
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5be/0x970 net/socket.c:2518
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572
 __sys_sendmsg net/socket.c:2601 [inline]
 __do_sys_sendmsg net/socket.c:2610 [inline]
 __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f974979c819
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:00007f974a6bb028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f9749a15fa0 RCX: 00007f974979c819
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f9749832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9749a16038 R14: 00007f9749a15fa0 R15: 00007ffd87de8b48
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001640dc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x59037
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0000a5f748 ffffea0001f0dd88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 2, tgid 2 (kthreadd), ts 259493890642, free_ts 261482570744
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559
 prep_new_page mm/page_alloc.c:2566 [inline]
 get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657
 __alloc_pages_bulk+0x49a/0x920 mm/page_alloc.c:5605
 vm_area_alloc_pages mm/vmalloc.c:2968 [inline]
 __vmalloc_area_node mm/vmalloc.c:3071 [inline]
 __vmalloc_node_range+0x70f/0x13b0 mm/vmalloc.c:3243
 alloc_thread_stack_node kernel/fork.c:312 [inline]
 dup_task_struct+0x3d3/0x6b0 kernel/fork.c:994
 copy_process+0x5fa/0x4030 kernel/fork.c:2186
 kernel_clone+0x24b/0x900 kernel/fork.c:2762
 kernel_thread+0x118/0x180 kernel/fork.c:2822
 create_kthread kernel/kthread.c:399 [inline]
 kthreadd+0x555/0x700 kernel/kthread.c:748
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1486 [inline]
 free_pcp_prepare mm/page_alloc.c:1536 [inline]
 free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508
 __vunmap+0x856/0xa00 mm/vmalloc.c:2726
 free_work+0x56/0x80 mm/vmalloc.c:97
 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff888059037880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888059037900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888059037980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                                ^
 ffff888059037a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888059037a80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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