================================================================== BUG: KASAN: use-after-free in ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909 Read of size 2 at addr ffff0000e3516dfb by task syz.5.2902/13722 CPU: 0 PID: 13722 Comm: syz.5.2902 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load2_noabort+0x2c/0x38 mm/kasan/report_generic.c:349 ieee80211_monitor_select_queue+0x20c/0x210 net/mac80211/iface.c:909 netdev_core_pick_tx+0x130/0x320 net/core/dev.c:4245 __dev_queue_xmit+0x738/0x3118 net/core/dev.c:4331 dev_queue_xmit+0x24/0x34 include/linux/netdevice.h:3051 packet_snd net/packet/af_packet.c:3127 [inline] packet_sendmsg+0x2f9c/0x3fd0 net/packet/af_packet.c:3158 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518 ___sys_sendmsg net/socket.c:2572 [inline] __sys_sendmsg+0x288/0x374 net/socket.c:2601 __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg net/socket.c:2608 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2608 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 13644: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 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+0xe0/0x16c mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x264/0x714 net/core/skbuff.c:515 __pskb_copy_fclone+0xb4/0xd08 net/core/skbuff.c:1771 __pskb_copy include/linux/skbuff.h:1367 [inline] pskb_copy include/linux/skbuff.h:3605 [inline] hwsim_hw_xmit+0x32c/0x6bc drivers/net/ieee802154/mac802154_hwsim.c:132 drv_xmit_async net/mac802154/driver-ops.h:16 [inline] ieee802154_tx+0x1dc/0x3f0 net/mac802154/tx.c:83 ieee802154_subif_start_xmit+0x98/0x138 net/mac802154/tx.c:132 __netdev_start_xmit include/linux/netdevice.h:4894 [inline] netdev_start_xmit include/linux/netdevice.h:4908 [inline] xmit_one net/core/dev.c:3695 [inline] dev_hard_start_xmit+0x234/0x8cc net/core/dev.c:3711 sch_direct_xmit+0x210/0x474 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3932 [inline] __dev_queue_xmit+0x13bc/0x3118 net/core/dev.c:4337 dev_queue_xmit include/linux/netdevice.h:3051 [inline] dgram_sendmsg+0x55c/0xad4 net/ieee802154/socket.c:691 ieee802154_sock_sendmsg+0x94/0x110 net/ieee802154/socket.c:96 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518 ___sys_sendmsg net/socket.c:2572 [inline] __sys_sendmmsg+0x344/0x834 net/socket.c:2658 __do_sys_sendmmsg net/socket.c:2687 [inline] __se_sys_sendmmsg net/socket.c:2684 [inline] __arm64_sys_sendmmsg+0xa0/0xbc net/socket.c:2684 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 13644: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x218 mm/slub.c:3700 kfree+0xd0/0x1a8 mm/slab_common.c:988 skb_free_head net/core/skbuff.c:762 [inline] skb_release_data+0x434/0x63c net/core/skbuff.c:791 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb net/core/skbuff.c:870 [inline] kfree_skb_reason+0x198/0x418 net/core/skbuff.c:893 kfree_skb include/linux/skbuff.h:1252 [inline] ieee802154_rcv+0x304/0x7fc net/ieee802154/socket.c:1095 __netif_receive_skb_one_core net/core/dev.c:5619 [inline] __netif_receive_skb+0xcc/0x2a8 net/core/dev.c:5733 netif_receive_skb_internal net/core/dev.c:5819 [inline] netif_receive_skb+0x1e8/0x924 net/core/dev.c:5878 ieee802154_deliver_skb net/mac802154/rx.c:29 [inline] ieee802154_subif_frame net/mac802154/rx.c:102 [inline] __ieee802154_rx_handle_packet net/mac802154/rx.c:212 [inline] ieee802154_rx+0xd90/0x13a8 net/mac802154/rx.c:284 ieee802154_tasklet_handler+0xa8/0x138 net/mac802154/main.c:35 tasklet_action_common+0x320/0x41c kernel/softirq.c:827 tasklet_action+0x60/0x84 kernel/softirq.c:852 handle_softirqs+0x318/0xc60 kernel/softirq.c:596 __do_softirq+0x14/0x20 kernel/softirq.c:630 The buggy address belongs to the object at ffff0000e3516c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 507 bytes inside of 512-byte region [ffff0000e3516c00, ffff0000e3516e00) The buggy address belongs to the physical page: page:000000006ffb2b66 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x123514 head:000000006ffb2b66 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c0002600 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e3516c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000e3516d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000e3516d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000e3516e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000e3516e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================