================================================================== BUG: KASAN: slab-out-of-bounds in ieee80211_monitor_select_queue+0x23a/0x240 net/mac80211/iface.c:772 Read of size 2 at addr ffff88807e2aadfb by task syz.4.767/8226 CPU: 1 PID: 8226 Comm: syz.4.767 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 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:772 netdev_core_pick_tx+0x12c/0x300 net/core/dev.c:4185 __dev_queue_xmit+0x797/0x2e50 net/core/dev.c:4262 packet_snd net/packet/af_packet.c:3122 [inline] packet_sendmsg+0x3b4f/0x4de0 net/packet/af_packet.c:3153 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: 0033:0x7f7ad6e3b559 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:00007f7ad5092028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7ad70c1fa0 RCX: 00007f7ad6e3b559 RDX: 0000000000000000 RSI: 0000200000000380 RDI: 0000000000000005 RBP: 00007f7ad6ed2b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7ad70c2038 R14: 00007f7ad70c1fa0 R15: 00007ffcb1172668 Allocated by task 4196: 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+0x35f/0x6a0 net/sched/sch_generic.c:810 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:961 mq_init+0x2c4/0x650 net/sched/sch_mq.c:90 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:961 attach_default_qdiscs net/sched/sch_generic.c:1140 [inline] dev_activate+0x192/0x1330 net/sched/sch_generic.c:1194 __dev_open+0x33b/0x430 net/core/dev.c:1559 __dev_change_flags+0x1e4/0x6a0 net/core/dev.c:8880 dev_change_flags+0x78/0x1a0 net/core/dev.c:8951 devinet_ioctl+0x810/0x1ba0 net/ipv4/devinet.c:1152 inet_ioctl+0x2fa/0x460 net/ipv4/af_inet.c:987 sock_do_ioctl+0xfb/0x320 net/socket.c:1148 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 The buggy address belongs to the object at ffff88807e2a8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 3579 bytes to the right of 8192-byte region [ffff88807e2a8000, ffff88807e2aa000) The buggy address belongs to the page: page:ffffea0001f8aa00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e2a8 head:ffffea0001f8aa00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888017842280 raw: 0000000000000000 0000000000020002 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4196, ts 70385871507, free_ts 70272053745 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:810 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:961 mq_init+0x2c4/0x650 net/sched/sch_mq.c:90 qdisc_create_dflt+0x11a/0x410 net/sched/sch_generic.c:961 attach_default_qdiscs net/sched/sch_generic.c:1140 [inline] dev_activate+0x192/0x1330 net/sched/sch_generic.c:1194 __dev_open+0x33b/0x430 net/core/dev.c:1559 __dev_change_flags+0x1e4/0x6a0 net/core/dev.c:8880 dev_change_flags+0x78/0x1a0 net/core/dev.c:8951 devinet_ioctl+0x810/0x1ba0 net/ipv4/devinet.c:1152 inet_ioctl+0x2fa/0x460 net/ipv4/af_inet.c:987 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] kmem_cache_alloc_node+0x184/0x2c0 mm/slub.c:3261 __alloc_skb+0xf4/0x750 net/core/skbuff.c:415 alloc_skb include/linux/skbuff.h:1162 [inline] mld_newpack+0x12f/0xba0 net/ipv6/mcast.c:1773 add_grhead net/ipv6/mcast.c:1884 [inline] add_grec+0x1364/0x1840 net/ipv6/mcast.c:2023 mld_send_initial_cr+0x288/0x540 net/ipv6/mcast.c:2266 mld_dad_work+0x39/0x470 net/ipv6/mcast.c:2292 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 Memory state around the buggy address: ffff88807e2aac80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e2aad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807e2aad80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807e2aae00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807e2aae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================