================================================================== BUG: KASAN: slab-use-after-free in drm_atomic_helper_wait_for_vblanks.part.0+0x7d5/0x8a0 drivers/gpu/drm/drm_atomic_helper.c:1905 Read of size 1 at addr ffff88803df7dc09 by task kworker/u33:0/37 CPU: 0 UID: 0 PID: 37 Comm: kworker/u33:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events_unbound commit_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 drm_atomic_helper_wait_for_vblanks.part.0+0x7d5/0x8a0 drivers/gpu/drm/drm_atomic_helper.c:1905 drm_atomic_helper_wait_for_vblanks drivers/gpu/drm/drm_atomic_helper.c:1901 [inline] drm_atomic_helper_commit_tail+0xff/0x130 drivers/gpu/drm/drm_atomic_helper.c:2003 commit_tail+0x338/0x430 drivers/gpu/drm/drm_atomic_helper.c:2080 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 8213: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] drm_atomic_helper_crtc_duplicate_state+0x72/0xd0 drivers/gpu/drm/drm_atomic_state_helper.c:204 drm_atomic_get_crtc_state+0x1de/0x690 drivers/gpu/drm/drm_atomic.c:462 drm_atomic_set_property+0x165/0x3f90 drivers/gpu/drm/drm_atomic_uapi.c:1244 drm_mode_atomic_ioctl+0x6ed/0x2940 drivers/gpu/drm/drm_atomic_uapi.c:1744 drm_ioctl_kernel+0x1f3/0x3e0 drivers/gpu/drm/drm_ioctl.c:817 drm_ioctl+0x5e6/0xc60 drivers/gpu/drm/drm_ioctl.c:914 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 1030: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kfree+0x22b/0x6d0 mm/slub.c:6802 drm_atomic_commit_default_clear+0x465/0x10c0 drivers/gpu/drm/drm_atomic.c:311 drm_atomic_commit_clear drivers/gpu/drm/drm_atomic.c:394 [inline] __drm_atomic_commit_free+0x185/0x2f0 drivers/gpu/drm/drm_atomic.c:411 kref_put include/linux/kref.h:65 [inline] drm_atomic_commit_put include/drm/drm_atomic.h:713 [inline] drm_atomic_helper_dirtyfb+0x578/0x790 drivers/gpu/drm/drm_damage_helper.c:195 drm_fbdev_shmem_helper_fb_dirty+0x1cc/0x350 drivers/gpu/drm/drm_fbdev_shmem.c:117 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:339 [inline] drm_fb_helper_damage_work+0x4c8/0xab0 drivers/gpu/drm/drm_fb_helper.c:365 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88803df7dc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 9 bytes inside of freed 512-byte region [ffff88803df7dc00, ffff88803df7de00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3df7c head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801d042c80 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801d042c80 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffffffffffff01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5758, tgid 5758 (syz-executor), ts 111722439737 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x4f4/0x6d0 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] mca_alloc net/ipv6/mcast.c:890 [inline] __ipv6_dev_mc_inc+0x2f1/0xc80 net/ipv6/mcast.c:981 ipv6_add_dev+0xb78/0x1520 net/ipv6/addrconf.c:472 addrconf_notify+0x5db/0x1ba0 net/ipv6/addrconf.c:3686 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275 call_netdevice_notifiers_extack net/core/dev.c:2313 [inline] call_netdevice_notifiers net/core/dev.c:2327 [inline] register_netdevice+0x1998/0x25a0 net/core/dev.c:11587 veth_newlink+0x316/0xce0 drivers/net/veth.c:1873 rtnl_newlink_create net/core/rtnetlink.c:3974 [inline] __rtnl_newlink net/core/rtnetlink.c:4103 [inline] rtnl_newlink+0x1697/0x2620 net/core/rtnetlink.c:4220 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7137 page last free pid 5758 tgid 5758 ts 111617906902 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] __kmalloc_cache_noprof+0x278/0x6d0 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:663 [inline] netdevice_event+0x308/0x9a0 drivers/infiniband/core/roce_gid_mgmt.c:822 notifier_call_chain+0x99/0x3f0 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2275 __netdev_upper_dev_link+0x43c/0x7e0 net/core/dev.c:9034 netdev_master_upper_dev_link+0x9f/0xd0 net/core/dev.c:9104 batadv_hardif_enable_interface+0x87c/0xf80 net/batman-adv/hard-interface.c:845 do_set_master+0x40f/0x730 net/core/rtnetlink.c:3076 do_setlink.isra.0+0xb2b/0x3e60 net/core/rtnetlink.c:3278 rtnl_changelink net/core/rtnetlink.c:3910 [inline] __rtnl_newlink net/core/rtnetlink.c:4081 [inline] rtnl_newlink+0x13c1/0x2620 net/core/rtnetlink.c:4220 rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:7137 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2579 Memory state around the buggy address: ffff88803df7db00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803df7db80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803df7dc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803df7dc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803df7dd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================