==================================================================
BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:909
Read of size 2 at addr ffff8880239fadfb by task syz.2.538/7282

CPU: 1 PID: 7282 Comm: syz.2.538 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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+0x12c/0x360 net/core/dev.c:4245
 __dev_queue_xmit+0xb45/0x3810 net/core/dev.c:4331
 packet_snd net/packet/af_packet.c:3133 [inline]
 packet_sendmsg+0x3b95/0x4de0 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
 __sys_sendmsg net/socket.c:2602 [inline]
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg+0x1c3/0x2b0 net/socket.c:2609
 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: 0033:0x7f764a99ce59
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:00007f764b7ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f764ac15fa0 RCX: 00007f764a99ce59
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f764aa32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f764ac16038 R14: 00007f764ac15fa0 R15: 00007fff389cf428
 </TASK>

Allocated by task 5458:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 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+0xb0/0x240 mm/slab_common.c:956
 kmemdup+0x27/0x60 mm/util.c:129
 kmemdup include/linux/fortify-string.h:585 [inline]
 bpf_prog_store_orig_filter net/core/filter.c:1157 [inline]
 bpf_prog_create_from_user+0x284/0x420 net/core/filter.c:1441
 seccomp_prepare_filter kernel/seccomp.c:671 [inline]
 seccomp_prepare_user_filter kernel/seccomp.c:708 [inline]
 seccomp_set_mode_filter kernel/seccomp.c:1869 [inline]
 do_seccomp+0x806/0xe00 kernel/seccomp.c:1989
 __do_sys_prctl kernel/sys.c:2477 [inline]
 __se_sys_prctl+0x401/0x1100 kernel/sys.c:2395
 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

The buggy address belongs to the object at ffff8880239fa000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1531 bytes to the right of
 2048-byte region [ffff8880239fa000, ffff8880239fa800)

The buggy address belongs to the physical page:
page:ffffea00008e7e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880239fe000 pfn:0x239f8
head:ffffea00008e7e00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea000164e608 ffffea000071d608 ffff888017442000
raw: ffff8880239fe000 0000000000080007 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 4333, tgid 4333 (kworker/0:5), ts 90711947122, free_ts 90707820145
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
 prep_new_page mm/page_alloc.c:2567 [inline]
 get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
 alloc_slab_page+0x5d/0x180 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:1997
 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc_node_track_caller+0xa0/0x240 mm/slab_common.c:956
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x226/0x7d0 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1303 [inline]
 mld_newpack+0x12d/0xc10 net/ipv6/mcast.c:1745
 add_grhead net/ipv6/mcast.c:1856 [inline]
 add_grec+0x140e/0x1910 net/ipv6/mcast.c:1994
 mld_send_initial_cr+0xed/0x240 net/ipv6/mcast.c:2241
 ipv6_mc_dad_complete+0x84/0x210 net/ipv6/mcast.c:2252
 addrconf_dad_completed+0x7bb/0xd90 net/ipv6/addrconf.c:4276
 addrconf_dad_work+0xc68/0x1500 net/ipv6/addrconf.c:-1
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1487 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
 free_slab mm/slub.c:2036 [inline]
 discard_slab mm/slub.c:2042 [inline]
 __unfreeze_partials+0x188/0x1e0 mm/slub.c:2591
 put_cpu_partial+0x17c/0x250 mm/slub.c:2667
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3383
 getname_flags+0xb7/0x500 fs/namei.c:139
 do_sys_openat2+0xdd/0x4f0 fs/open.c:1314
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 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

Memory state around the buggy address:
 ffff8880239fac80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880239fad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880239fad80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff8880239fae00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880239fae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================