================================================================== BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:764 Read of size 2 at addr ffff8880621a09fb by task syz.1.2570/12986 CPU: 0 PID: 12986 Comm: syz.1.2570 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 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: 0033:0x7faeed0a5dd9 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:00007faeeb2ff028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007faeed31efa0 RCX: 00007faeed0a5dd9 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000004 RBP: 00007faeed13bd69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007faeed31f038 R14: 00007faeed31efa0 R15: 00007ffcd000b218 Allocated by task 4274: 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_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x22c/0x750 net/core/skbuff.c:427 skb_copy+0x139/0x790 net/core/skbuff.c:1595 mac80211_hwsim_tx_frame_no_nl+0xce0/0x1600 drivers/net/wireless/mac80211_hwsim.c:1569 mac80211_hwsim_tx+0x742/0xe20 drivers/net/wireless/mac80211_hwsim.c:1673 drv_tx net/mac80211/driver-ops.h:35 [inline] ieee80211_tx_frags+0x3f4/0x8d0 net/mac80211/tx.c:1721 __ieee80211_tx+0x21b/0x4e0 net/mac80211/tx.c:1775 ieee80211_tx+0x30f/0x460 net/mac80211/tx.c:1955 __ieee80211_tx_skb_tid_band+0x165/0x200 net/mac80211/tx.c:5677 ieee80211_tx_skb_tid net/mac80211/ieee80211_i.h:2221 [inline] ieee80211_tx_skb+0x142/0x270 net/mac80211/ieee80211_i.h:2230 ieee80211_auth+0x499/0x8b0 net/mac80211/mlme.c:4486 ieee80211_sta_work+0x12ed/0x5a10 net/mac80211/mlme.c:4615 cfg80211_wiphy_work+0x221/0x260 net/wireless/core.c:433 process_one_work+0x85f/0x1010 kernel/workqueue.c:2310 worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff8880621a0800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff8880621a0800, ffff8880621a0a00) The buggy address belongs to the page: page:ffffea0001886800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880621a0400 pfn:0x621a0 head:ffffea0001886800 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00017a4508 ffffea00017ccf08 ffff888016c41c80 raw: ffff8880621a0400 0000000000100009 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4188, ts 64409909177, free_ts 64409792966 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] device_private_init drivers/base/core.c:3256 [inline] device_add+0xba/0xfb0 drivers/base/core.c:3306 netdev_register_kobject+0x184/0x320 net/core/net-sysfs.c:2014 register_netdevice+0x1042/0x1710 net/core/dev.c:10423 br_dev_newlink+0x23/0x100 net/bridge/br_netlink.c:1443 __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 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 mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0xb3/0xd0 mm/kasan/common.c:467 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+0x100/0x290 mm/slub.c:3238 kmem_cache_zalloc include/linux/slab.h:728 [inline] fill_pool lib/debugobjects.c:172 [inline] __debug_object_init+0x8ba/0xc80 lib/debugobjects.c:615 debug_hrtimer_init kernel/time/hrtimer.c:404 [inline] debug_init+0x23/0x1d0 kernel/time/hrtimer.c:458 hrtimer_init+0x2f/0x220 kernel/time/hrtimer.c:1592 pm_runtime_init+0x244/0x360 drivers/base/power/runtime.c:1738 device_pm_init drivers/base/power/power.h:169 [inline] device_initialize+0x261/0x4d0 drivers/base/core.c:2893 netdev_register_kobject+0x2f/0x320 net/core/net-sysfs.c:1990 register_netdevice+0x1042/0x1710 net/core/dev.c:10423 br_dev_newlink+0x23/0x100 net/bridge/br_netlink.c:1443 __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 Memory state around the buggy address: ffff8880621a0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880621a0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880621a0980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880621a0a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880621a0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================