================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x2f/0x140 lib/list_debug.c:49 Read of size 8 at addr ffff88804295d988 by task kworker/0:4/5335 CPU: 0 UID: 0 PID: 5335 Comm: kworker/0:4 Not tainted 6.12.0-syzkaller-10681-g65ae975e97d5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events binder_deferred_func Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 __list_del_entry_valid_or_report+0x2f/0x140 lib/list_debug.c:49 __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] binder_dequeue_work_head_ilocked drivers/android/binder.c:540 [inline] binder_release_work+0xc7/0x480 drivers/android/binder.c:5110 binder_deferred_release drivers/android/binder.c:6261 [inline] binder_deferred_func+0x1275/0x1460 drivers/android/binder.c:6296 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5342: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4314 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] binder_request_freeze_notification drivers/android/binder.c:3855 [inline] binder_thread_write drivers/android/binder.c:4485 [inline] binder_ioctl_write_read+0xe7f/0xb560 drivers/android/binder.c:5387 binder_ioctl+0x436/0x1cc0 drivers/android/binder.c:5718 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5335: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kfree+0x196/0x420 mm/slub.c:4746 binder_free_ref drivers/android/binder.c:1355 [inline] binder_deferred_release drivers/android/binder.c:6256 [inline] binder_deferred_func+0x11df/0x1460 drivers/android/binder.c:6296 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88804295d980 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 8 bytes inside of freed 64-byte region [ffff88804295d980, ffff88804295d9c0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4295d anon flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff88801ac418c0 ffffea0000fbcb40 0000000000000005 raw: 0000000000000000 0000000000200020 00000001f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 4865, tgid 4865 (kworker/0:3), ts 60247366369, free_ts 58610899760 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2408 allocate_slab+0x5a/0x2f0 mm/slub.c:2574 new_slab mm/slub.c:2627 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3815 __slab_alloc+0x58/0xa0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_noprof+0x2e6/0x4c0 mm/slub.c:4295 kmalloc_noprof include/linux/slab.h:905 [inline] alloc_indirect_split drivers/virtio/virtio_ring.c:492 [inline] virtqueue_add_split drivers/virtio/virtio_ring.c:564 [inline] virtqueue_add+0x545/0x4770 drivers/virtio/virtio_ring.c:2282 virtqueue_add_sgs+0xfe/0x120 drivers/virtio/virtio_ring.c:2316 virtio_gpu_queue_ctrl_sgs drivers/gpu/drm/virtio/virtgpu_vq.c:357 [inline] virtio_gpu_queue_fenced_ctrl_buffer+0xa88/0xff0 drivers/gpu/drm/virtio/virtgpu_vq.c:415 virtio_gpu_update_dumb_bo drivers/gpu/drm/virtio/virtgpu_plane.c:130 [inline] virtio_gpu_primary_plane_update+0x44a/0x1590 drivers/gpu/drm/virtio/virtgpu_plane.c:201 drm_atomic_helper_commit_planes+0x5ee/0xe00 drivers/gpu/drm/drm_atomic_helper.c:2800 drm_atomic_helper_commit_tail+0x5e/0x500 drivers/gpu/drm/drm_atomic_helper.c:1750 commit_tail+0x2c1/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:1835 page last free pid 5321 tgid 5321 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2657 tlb_batch_list_free mm/mmu_gather.c:159 [inline] tlb_finish_mmu+0x11f/0x200 mm/mmu_gather.c:468 exit_mmap+0x496/0xc40 mm/mmap.c:1680 __mmput+0x115/0x3c0 kernel/fork.c:1353 exit_mm+0x220/0x310 kernel/exit.c:570 do_exit+0x9b2/0x28e0 kernel/exit.c:925 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 __do_sys_exit_group kernel/exit.c:1098 [inline] __se_sys_exit_group kernel/exit.c:1096 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1096 x64_sys_call+0x26a8/0x26b0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88804295d880: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88804295d900: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc >ffff88804295d980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88804295da00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88804295da80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ==================================================================