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BUG: KASAN: slab-out-of-bounds in change_page_attr_set_clr+0x625/0xfc0
Read of size 8 at addr ffff88810a81d8e0 by task syz.2.1421/9861

CPU: 1 UID: 0 PID: 9861 Comm: syz.2.1421 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 change_page_attr_set_clr+0x625/0xfc0
 _set_pages_array+0x145/0x270
 drm_gem_shmem_get_pages_locked+0x2d0/0x440
 drm_gem_shmem_pin_locked+0x22c/0x460
 drm_gem_map_attach+0x19c/0x1f0
 dma_buf_dynamic_attach+0x1ea/0x3d0
 drm_gem_shmem_prime_import_no_map+0xc1/0x2f0
 drm_gem_prime_fd_to_handle+0x196/0x4d0
 drm_ioctl_kernel+0x2cf/0x390
 drm_ioctl+0x67f/0xb10
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f41f8d8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f41f9bd8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f41f8fc5fa0 RCX: 00007f41f8d8ebe9
RDX: 0000200000000300 RSI: 00000000c00c642e RDI: 0000000000000004
RBP: 00007f41f8e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f41f8fc6038 R14: 00007f41f8fc5fa0 R15: 00007ffe9ac00428
 </TASK>

Allocated by task 9861:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kvmalloc_node_noprof+0x5cd/0x910
 drm_gem_get_pages+0x166/0xa20
 drm_gem_shmem_get_pages_locked+0x201/0x440
 drm_gem_shmem_pin_locked+0x22c/0x460
 drm_gem_map_attach+0x19c/0x1f0
 dma_buf_dynamic_attach+0x1ea/0x3d0
 drm_gem_shmem_prime_import_no_map+0xc1/0x2f0
 drm_gem_prime_fd_to_handle+0x196/0x4d0
 drm_ioctl_kernel+0x2cf/0x390
 drm_ioctl+0x67f/0xb10
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88810a81d880
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes to the right of
 allocated 96-byte region [ffff88810a81d880, ffff88810a81d8e0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a81d
flags: 0x57ff00000000000(node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000000 ffff88801a841280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080200020 00000000f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 12404971953, free_ts 12042416652
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x330
 ___slab_alloc+0xbd1/0x13f0
 __slab_alloc+0x55/0xa0
 __kmalloc_cache_noprof+0x411/0x6f0
 get_device_parent+0x255/0x3a0
 device_add+0x2e1/0xb50
 device_create+0x25b/0x2f0
 mon_bin_add+0xb6/0x130
 mon_bus_init+0x162/0x2a0
 mon_notify+0x112/0x3f0
 notifier_call_chain+0x1b6/0x3e0
 blocking_notifier_call_chain+0x6a/0x90
page last free pid 793 tgid 793 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 vfree+0x25a/0x400
 delayed_vfree_work+0x55/0x80
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x47f/0x820
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff88810a81d780: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff88810a81d800: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
>ffff88810a81d880: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                       ^
 ffff88810a81d900: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
 ffff88810a81d980: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
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