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BUG: KASAN: slab-out-of-bounds in __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline]
BUG: KASAN: slab-out-of-bounds in __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306
Read of size 8 at addr ffff8880004a8af8 by task syz.9.4052/20286

CPU: 0 UID: 0 PID: 20286 Comm: syz.9.4052 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __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+0xcd/0x630 mm/kasan/report.c:482
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 __cpa_addr arch/x86/mm/pat/set_memory.c:309 [inline]
 __cpa_addr+0x1d3/0x220 arch/x86/mm/pat/set_memory.c:306
 cpa_flush+0xec/0x8a0 arch/x86/mm/pat/set_memory.c:449
 change_page_attr_set_clr arch/x86/mm/pat/set_memory.c:2115 [inline]
 cpa_clear_pages_array arch/x86/mm/pat/set_memory.c:2144 [inline]
 set_pages_array_wb+0x238/0x280 arch/x86/mm/pat/set_memory.c:2572
 drm_gem_shmem_put_pages_locked+0x27e/0x300 drivers/gpu/drm/drm_gem_shmem_helper.c:239
 drm_gem_shmem_vm_close+0x63/0xc0 drivers/gpu/drm/drm_gem_shmem_helper.c:596
 vma_close mm/internal.h:190 [inline]
 vms_clean_up_area mm/vma.c:1250 [inline]
 __mmap_prepare mm/vma.c:2396 [inline]
 __mmap_region+0x6bf/0x27a0 mm/vma.c:2652
 mmap_region+0x1ab/0x3f0 mm/vma.c:2740
 do_mmap+0xa3e/0x1210 mm/mmap.c:558
 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581
 ksys_mmap_pgoff+0x7d/0x5c0 mm/mmap.c:604
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff5b1f8efc9
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:00007ff5b2e2f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ff5b21e6180 RCX: 00007ff5b1f8efc9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007ff5b2011f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff5b21e6218 R14: 00007ff5b21e6180 R15: 00007ffde73d5aa8
 </TASK>

Allocated by task 20286:
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:56
 kasan_save_track+0x14/0x30 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5634 [inline]
 __kvmalloc_node_noprof+0x3a3/0x9c0 mm/slub.c:7089
 kvmalloc_array_node_noprof include/linux/slab.h:1122 [inline]
 drm_gem_get_pages+0x144/0xa10 drivers/gpu/drm/drm_gem.c:647
 drm_gem_shmem_get_pages_locked+0x1e6/0x490 drivers/gpu/drm/drm_gem_shmem_helper.c:200
 drm_gem_shmem_mmap drivers/gpu/drm/drm_gem_shmem_helper.c:646 [inline]
 drm_gem_shmem_mmap+0xc9/0x550 drivers/gpu/drm/drm_gem_shmem_helper.c:620
 drm_gem_mmap_obj+0x1b5/0x560 drivers/gpu/drm/drm_gem.c:1167
 drm_gem_mmap+0x40b/0x620 drivers/gpu/drm/drm_gem.c:1245
 vfs_mmap include/linux/fs.h:2405 [inline]
 mmap_file mm/internal.h:167 [inline]
 __mmap_new_file_vma mm/vma.c:2413 [inline]
 __mmap_new_vma mm/vma.c:2476 [inline]
 __mmap_region+0x1309/0x27a0 mm/vma.c:2670
 mmap_region+0x1ab/0x3f0 mm/vma.c:2740
 do_mmap+0xa3e/0x1210 mm/mmap.c:558
 vm_mmap_pgoff+0x29e/0x470 mm/util.c:581
 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:604
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880004a8a00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 0 bytes to the right of
 allocated 248-byte region [ffff8880004a8a00, ffff8880004a8af8)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4a8
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x7ff00000000040(head|node=0|zone=0|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 007ff00000000040 ffff88801b442b40 ffffea0000ac1280 0000000000000004
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 007ff00000000040 ffff88801b442b40 ffffea0000ac1280 0000000000000004
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 007ff00000000001 ffffea0000012a01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 19746, tgid 19739 (syz.0.3865), ts 462234501176, free_ts 462212248155
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x10a3/0x3a30 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x25f/0x2470 mm/page_alloc.c:5183
 alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3046 [inline]
 allocate_slab mm/slub.c:3219 [inline]
 new_slab+0x24a/0x360 mm/slub.c:3273
 ___slab_alloc+0xdc4/0x1ae0 mm/slub.c:4643
 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4762
 __slab_alloc_node mm/slub.c:4838 [inline]
 slab_alloc_node mm/slub.c:5260 [inline]
 __do_kmalloc_node mm/slub.c:5633 [inline]
 __kvmalloc_node_noprof+0x5aa/0x9c0 mm/slub.c:7089
 v4l2_ctrl_new+0x982/0x2190 drivers/media/v4l2-core/v4l2-ctrls-core.c:2031
 v4l2_ctrl_new_std+0x1be/0x290 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
 handler_new_ref+0x827/0xc60 drivers/media/v4l2-core/v4l2-ctrls-core.c:1772
 v4l2_ctrl_new+0x196c/0x2190 drivers/media/v4l2-core/v4l2-ctrls-core.c:2114
 v4l2_ctrl_new_std+0x1be/0x290 drivers/media/v4l2-core/v4l2-ctrls-core.c:2185
 vicodec_open+0x2a6/0xf70 drivers/media/test-drivers/vicodec/vicodec-core.c:1864
 v4l2_open+0x1d2/0x5e0 drivers/media/v4l2-core/v4l2-dev.c:433
 chrdev_open+0x234/0x6a0 fs/char_dev.c:414
page last free pid 19748 tgid 19739 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_pages_ok+0x725/0xf80 mm/page_alloc.c:1570
 map_update_elem+0x66a/0x940 kernel/bpf/syscall.c:1825
 __sys_bpf+0x1573/0x4980 kernel/bpf/syscall.c:6137
 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6257 [inline]
 __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6257
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8880004a8980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880004a8a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880004a8a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
                                                                ^
 ffff8880004a8b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880004a8b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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