================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline] BUG: KASAN: slab-use-after-free in usb_anchor_suspend_wakeups+0x2c/0x74 drivers/usb/core/urb.c:927 Write of size 4 at addr ffff0000eb8e6110 by task swapper/1/0 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.14.0-rc7-syzkaller-00077-ga2392f333575 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x198/0x550 mm/kasan/report.c:521 kasan_report+0xd8/0x138 mm/kasan/report.c:634 kasan_check_range+0x268/0x2a8 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_inc include/linux/atomic/atomic-instrumented.h:435 [inline] usb_anchor_suspend_wakeups+0x2c/0x74 drivers/usb/core/urb.c:927 __usb_hcd_giveback_urb+0x1f4/0x570 drivers/usb/core/hcd.c:1636 usb_hcd_giveback_urb+0x108/0x3ac drivers/usb/core/hcd.c:1734 dummy_timer+0x658/0x3524 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x47c/0xca4 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x158/0x21c kernel/time/hrtimer.c:1882 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 __do_softirq+0x14/0x20 kernel/softirq.c:595 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:442 [inline] __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:662 irq_exit_rcu+0x14/0x84 kernel/softirq.c:678 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:48 (P) cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x1ec/0x4e0 kernel/sched/idle.c:325 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:423 secondary_start_kernel+0x1bc/0x1e4 arch/arm64/kernel/smp.c:279 __secondary_switched+0xc0/0xc4 arch/arm64/kernel/head.S:401 Allocated by task 8287: 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:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x2cc/0x428 mm/slub.c:4325 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] usbtmc_open+0xb0/0x748 drivers/usb/class/usbtmc.c:175 usb_open+0x138/0x1c8 drivers/usb/core/file.c:47 chrdev_open+0x3b0/0x4bc fs/char_dev.c:414 do_dentry_open+0xb7c/0x1538 fs/open.c:956 vfs_open+0x48/0x2d8 fs/open.c:1086 do_open fs/namei.c:3830 [inline] path_openat+0x2308/0x2b1c fs/namei.c:3989 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1428 do_sys_open fs/open.c:1443 [inline] __do_sys_openat fs/open.c:1459 [inline] __se_sys_openat fs/open.c:1454 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 8287: 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:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x180/0x478 mm/slub.c:4757 usbtmc_release+0x238/0x298 drivers/usb/class/usbtmc.c:261 __fput+0x340/0x760 fs/file_table.c:464 ____fput+0x20/0x30 fs/file_table.c:492 task_work_run+0x230/0x2e0 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000eb8e6000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 272 bytes inside of freed 1024-byte region [ffff0000eb8e6000, ffff0000eb8e6400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12b8e0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0001dc0 0000000000000000 0000000000000001 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0001dc0 0000000000000000 0000000000000001 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc3ae3801 ffffffffffffffff 0000000000000000 head: ffff000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000eb8e6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000eb8e6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000eb8e6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000eb8e6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000eb8e6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000000] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G B 6.14.0-rc7-syzkaller-00077-ga2392f333575 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 404000c5 (nZcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : dev_vprintk_emit+0x108/0x3bc drivers/base/core.c:4889 lr : set_dev_info drivers/base/core.c:4847 [inline] lr : dev_vprintk_emit+0xdc/0x3bc drivers/base/core.c:4889 sp : ffff800080017480 x29: ffff800080017580 x28: ffff8000800174a0 x27: ffff700010002e94 x26: ffff80008cc55080 x25: 0000000000000033 x24: 0000000000000002 x23: ffff80009046e178 x22: ffff8000800174c0 x21: ffff800080017680 x20: 0000000000000003 x19: dfff800000000000 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008b728788 x15: 0000000000000008 x14: 1ffff00010002e98 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700010002ea0 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff800080017730 x5 : ffff8000800176a0 x4 : 0000000000000000 x3 : ffff800080118368 x2 : ffffffffffffffc0 x1 : 0000000000000000 x0 : ffff8000800174c0 Call trace: dev_vprintk_emit+0x108/0x3bc drivers/base/core.c:4889 (P) dev_printk_emit+0xec/0x13c drivers/base/core.c:4902 __dev_printk+0x178/0x1a0 drivers/base/core.c:4914 _dev_err+0x104/0x150 drivers/base/core.c:4957 usbtmc_read_bulk_cb+0x21c/0x38c drivers/usb/class/usbtmc.c:781 __usb_hcd_giveback_urb+0x308/0x570 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x108/0x3ac drivers/usb/core/hcd.c:1734 dummy_timer+0x658/0x3524 drivers/usb/gadget/udc/dummy_hcd.c:1994 __run_hrtimer kernel/time/hrtimer.c:1801 [inline] __hrtimer_run_queues+0x47c/0xca4 kernel/time/hrtimer.c:1865 hrtimer_run_softirq+0x158/0x21c kernel/time/hrtimer.c:1882 handle_softirqs+0x320/0xd34 kernel/softirq.c:561 __do_softirq+0x14/0x20 kernel/softirq.c:595 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:442 [inline] __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:662 irq_exit_rcu+0x14/0x84 kernel/softirq.c:678 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 __daif_local_irq_enable arch/arm64/include/asm/irqflags.h:26 [inline] (P) arch_local_irq_enable+0x8/0xc arch/arm64/include/asm/irqflags.h:48 (P) cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x1ec/0x4e0 kernel/sched/idle.c:325 cpu_startup_entry+0x5c/0x74 kernel/sched/idle.c:423 secondary_start_kernel+0x1bc/0x1e4 arch/arm64/kernel/smp.c:279 __secondary_switched+0xc0/0xc4 arch/arm64/kernel/head.S:401 Code: f9400318 b4000c38 94162371 d343ff08 (38736908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f9400318 ldr x24, [x24] 4: b4000c38 cbz x24, 0x188 8: 94162371 bl 0x588dcc c: d343ff08 lsr x8, x24, #3 * 10: 38736908 ldrb w8, [x8, x19] <-- trapping instruction