================================================================== BUG: KASAN: slab-out-of-bounds in hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5972 [inline] BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x12ea/0x3ca0 net/bluetooth/hci_event.c:6245 Read of size 1 at addr ffff8880755a9c01 by task kworker/u5:0/147 CPU: 1 PID: 147 Comm: kworker/u5:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: hci4 hci_rx_work 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 hci_le_ext_adv_report_evt net/bluetooth/hci_event.c:5972 [inline] hci_le_meta_evt+0x12ea/0x3ca0 net/bluetooth/hci_event.c:6245 hci_event_packet+0xe0b/0x1310 net/bluetooth/hci_event.c:6562 hci_rx_work+0x255/0xa10 net/bluetooth/hci_core.c:5190 process_one_work+0x867/0xff0 kernel/workqueue.c:2310 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457 kthread+0x42e/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Allocated by task 6989: 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_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x22c/0x750 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1162 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:395 [inline] vhci_get_user drivers/bluetooth/hci_vhci.c:170 [inline] vhci_write+0xbd/0x440 drivers/bluetooth/hci_vhci.c:290 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 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 ffff8880755a9800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1 bytes to the right of 1024-byte region [ffff8880755a9800, ffff8880755a9c00) The buggy address belongs to the page: page:ffffea0001d56a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x755a8 head:ffffea0001d56a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000152e600 0000000200000002 ffff888016c41dc0 raw: 0000000000000000 0000000080100010 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 6567, ts 264581531599, free_ts 263452883874 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_track_caller+0x13d/0x3a0 mm/slub.c:4963 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x22c/0x750 net/core/skbuff.c:427 alloc_skb_fclone include/linux/skbuff.h:1212 [inline] tipc_buf_acquire net/tipc/msg.c:72 [inline] tipc_msg_create+0x46/0x4b0 net/tipc/msg.c:104 tipc_group_proto_xmit+0xcd/0x870 net/tipc/group.c:710 tipc_group_cong+0x4d4/0x5d0 net/tipc/group.c:446 tipc_group_bc_cong+0x14e/0x210 net/tipc/group.c:467 tipc_send_group_bcast+0x36b/0xad0 net/tipc/socket.c:1102 tipc_send_group_mcast net/tipc/socket.c:1183 [inline] __tipc_sendmsg+0x1e24/0x2b60 net/tipc/socket.c:1442 tipc_sendmsg+0x51/0x70 net/tipc/socket.c:1403 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 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 skb_free_frag include/linux/skbuff.h:3059 [inline] skb_free_head net/core/skbuff.c:653 [inline] skb_release_data+0x676/0x830 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:756 sk_eat_skb include/net/sock.h:2793 [inline] tcp_recvmsg_locked+0x143d/0x2690 net/ipv4/tcp.c:2520 tcp_recvmsg+0x22a/0x760 net/ipv4/tcp.c:2566 inet_recvmsg+0x146/0x200 net/ipv4/af_inet.c:868 sock_recvmsg_nosec net/socket.c:969 [inline] sock_recvmsg net/socket.c:987 [inline] sock_read_iter+0x2c2/0x380 net/socket.c:1068 call_read_iter include/linux/fs.h:2167 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x75e/0xd50 fs/read_write.c:485 ksys_read+0x153/0x260 fs/read_write.c:623 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 Memory state around the buggy address: ffff8880755a9b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880755a9b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880755a9c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880755a9c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880755a9d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================