Bluetooth: hci2: unexpected cc 0x0c38 length: 249 > 2 ================================================================== BUG: KASAN: double-free in kfree_skbmem+0x15c/0x1ec Free of addr ffff0000d9286780 by task kworker/u9:2/6285 CPU: 1 PID: 6285 Comm: kworker/u9:2 Not tainted 6.10.0-rc6-syzkaller-g8e2f4becf4fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: hci3 hci_rx_work Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report_invalid_free+0xc4/0x118 mm/kasan/report.c:563 poison_slab_object+0x140/0x180 mm/kasan/common.c:232 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kmem_cache_free+0x170/0x4d0 mm/slub.c:4513 kfree_skbmem+0x15c/0x1ec __kfree_skb net/core/skbuff.c:1188 [inline] kfree_skb_reason+0x1c0/0x490 net/core/skbuff.c:1223 kfree_skb include/linux/skbuff.h:1257 [inline] hci_req_sync_complete+0xb0/0x248 net/bluetooth/hci_request.c:109 hci_event_packet+0xab8/0x105c net/bluetooth/hci_event.c:7479 hci_rx_work+0x318/0xa78 net/bluetooth/hci_core.c:4074 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x938/0xecc kernel/workqueue.c:3409 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 6285: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3940 [inline] slab_alloc_node mm/slub.c:4002 [inline] kmem_cache_alloc_noprof+0x1c0/0x350 mm/slub.c:4009 skb_clone+0x1c8/0x330 net/core/skbuff.c:2052 hci_send_cmd_sync net/bluetooth/hci_core.c:4123 [inline] hci_cmd_work+0x174/0x568 net/bluetooth/hci_core.c:4143 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3248 process_scheduled_works kernel/workqueue.c:3329 [inline] worker_thread+0x938/0xecc kernel/workqueue.c:3409 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Freed by task 6294: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object+0x128/0x180 mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2196 [inline] slab_free mm/slub.c:4438 [inline] kmem_cache_free+0x170/0x4d0 mm/slub.c:4513 kfree_skbmem+0x15c/0x1ec __kfree_skb net/core/skbuff.c:1188 [inline] kfree_skb_reason+0x1c0/0x490 net/core/skbuff.c:1223 kfree_skb include/linux/skbuff.h:1257 [inline] __hci_req_sync+0x4e8/0x798 net/bluetooth/hci_request.c:184 hci_req_sync+0xa0/0xcc net/bluetooth/hci_request.c:206 hci_dev_cmd+0x304/0x8c0 net/bluetooth/hci_core.c:787 hci_sock_ioctl+0x4b8/0x7e4 net/bluetooth/hci_sock.c:1150 sock_do_ioctl+0x134/0x2d0 net/socket.c:1222 sock_ioctl+0x4ec/0x838 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:893 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000d9286780 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 0 bytes inside of 240-byte region [ffff0000d9286780, ffff0000d9286870) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119286 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffefff(slab) raw: 05ffc00000000000 ffff0000c1bcc780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000c000c 00000001ffffefff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d9286680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d9286700: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc >ffff0000d9286780: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d9286800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff0000d9286880: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ================================================================== Bluetooth: hci3: command 0x0000 tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci3: command 0x0000 tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci3: command 0x0000 tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci4: command tx timeout