================================================================== BUG: KASAN: slab-use-after-free in drm_atomic_helper_wait_for_vblanks.part.0+0x851/0x930 drivers/gpu/drm/drm_atomic_helper.c:1662 Read of size 1 at addr ffff8880253d5409 by task kworker/u32:8/1145 CPU: 2 UID: 0 PID: 1145 Comm: kworker/u32:8 Not tainted 6.12.0-syzkaller-09567-g7eef7e306d3c #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_unbound commit_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 drm_atomic_helper_wait_for_vblanks.part.0+0x851/0x930 drivers/gpu/drm/drm_atomic_helper.c:1662 drm_atomic_helper_wait_for_vblanks drivers/gpu/drm/drm_atomic_helper.c:1658 [inline] drm_atomic_helper_commit_tail+0xcb/0xf0 drivers/gpu/drm/drm_atomic_helper.c:1758 commit_tail+0x353/0x400 drivers/gpu/drm/drm_atomic_helper.c:1835 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6504: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kmalloc_noprof include/linux/slab.h:901 [inline] drm_atomic_helper_crtc_duplicate_state+0x70/0xd0 drivers/gpu/drm/drm_atomic_state_helper.c:177 drm_atomic_get_crtc_state+0x162/0x440 drivers/gpu/drm/drm_atomic.c:360 page_flip_common+0x57/0x320 drivers/gpu/drm/drm_atomic_helper.c:3631 drm_atomic_helper_page_flip+0xb6/0x180 drivers/gpu/drm/drm_atomic_helper.c:3692 drm_mode_page_flip_ioctl+0x1036/0x1460 drivers/gpu/drm/drm_plane.c:1516 drm_ioctl_kernel+0x1e6/0x3d0 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x5d6/0xc00 drivers/gpu/drm/drm_ioctl.c:893 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6503: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 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+0x14f/0x4b0 mm/slub.c:4746 drm_atomic_state_default_clear+0x43c/0xe00 drivers/gpu/drm/drm_atomic.c:224 drm_atomic_state_clear drivers/gpu/drm/drm_atomic.c:293 [inline] __drm_atomic_state_free+0x185/0x2b0 drivers/gpu/drm/drm_atomic.c:310 kref_put include/linux/kref.h:65 [inline] drm_atomic_state_put include/drm/drm_atomic.h:538 [inline] drm_client_modeset_commit_atomic+0x6b7/0x7f0 drivers/gpu/drm/drm_client_modeset.c:1076 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1173 drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1199 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:237 [inline] __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:216 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:264 [inline] drm_fb_helper_lastclose+0xc7/0x160 drivers/gpu/drm/drm_fb_helper.c:1975 drm_fbdev_client_restore+0x2c/0x40 drivers/gpu/drm/drm_fbdev_client.c:30 drm_client_dev_restore+0x188/0x2a0 drivers/gpu/drm/drm_client_event.c:104 drm_lastclose drivers/gpu/drm/drm_file.c:396 [inline] drm_release+0x2c2/0x360 drivers/gpu/drm/drm_file.c:429 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880253d5400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 9 bytes inside of freed 512-byte region [ffff8880253d5400, ffff8880253d5600) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x253d4 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 ffff88801b042c80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b042c80 dead000000000122 0000000000000000 head: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000 head: 00fff00000000002 ffffea000094f501 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 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 6502, tgid 6501 (syz.0.16), ts 83042253432, free_ts 83004944873 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab mm/slub.c:2574 [inline] new_slab+0x2c9/0x410 mm/slub.c:2627 ___slab_alloc+0xdac/0x1870 mm/slub.c:3815 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __kmalloc_cache_noprof+0xfa/0x410 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:901 [inline] drm_atomic_helper_crtc_duplicate_state+0x70/0xd0 drivers/gpu/drm/drm_atomic_state_helper.c:177 drm_atomic_get_crtc_state+0x162/0x440 drivers/gpu/drm/drm_atomic.c:360 page_flip_common+0x57/0x320 drivers/gpu/drm/drm_atomic_helper.c:3631 drm_atomic_helper_page_flip+0xb6/0x180 drivers/gpu/drm/drm_atomic_helper.c:3692 drm_mode_page_flip_ioctl+0x1036/0x1460 drivers/gpu/drm/drm_plane.c:1516 drm_ioctl_kernel+0x1e6/0x3d0 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x5d6/0xc00 drivers/gpu/drm/drm_ioctl.c:893 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 page last free pid 65 tgid 65 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 __folio_put+0x32a/0x450 mm/swap.c:112 rate_control_free_sta net/mac80211/rate.h:52 [inline] sta_info_free+0x292/0x460 net/mac80211/sta_info.c:435 __sta_info_flush+0x50a/0x730 net/mac80211/sta_info.c:1605 sta_info_flush net/mac80211/sta_info.h:919 [inline] ieee80211_ibss_disconnect+0x15c/0x8f0 net/mac80211/ibss.c:685 ieee80211_ibss_leave+0x16/0x160 net/mac80211/ibss.c:1829 rdev_leave_ibss net/wireless/rdev-ops.h:574 [inline] cfg80211_leave_ibss+0x1b4/0x490 net/wireless/ibss.c:203 cfg80211_leave+0x135/0x3f0 net/wireless/core.c:1343 cfg80211_netdev_notifier_call+0x2ca/0x1110 net/wireless/core.c:1547 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] __dev_close_many+0xf4/0x310 net/core/dev.c:1534 dev_close_many+0x24c/0x6a0 net/core/dev.c:1585 dev_close net/core/dev.c:1611 [inline] dev_close+0x181/0x230 net/core/dev.c:1605 cfg80211_shutdown_all_interfaces+0x9a/0x200 net/wireless/core.c:280 ieee80211_remove_interfaces+0xd2/0x760 net/mac80211/iface.c:2283 Memory state around the buggy address: ffff8880253d5300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880253d5380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880253d5400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880253d5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880253d5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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