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BUG: KASAN: use-after-free in mprotect_fixup+0x8fc/0x960 mm/mprotect.c:606
Read of size 8 at addr ffff8880797e46c0 by task syz-executor.3/30613

CPU: 1 PID: 30613 Comm: syz-executor.3 Not tainted 5.19.0-rc4-next-20220628-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:317 [inline]
 print_report.cold+0x2ba/0x719 mm/kasan/report.c:433
 kasan_report+0xbe/0x1f0 mm/kasan/report.c:495
 mprotect_fixup+0x8fc/0x960 mm/mprotect.c:606
 do_mprotect_pkey+0x70f/0xa80 mm/mprotect.c:781
 __do_sys_pkey_mprotect mm/mprotect.c:816 [inline]
 __se_sys_pkey_mprotect mm/mprotect.c:813 [inline]
 __x64_sys_pkey_mprotect+0x93/0xf0 mm/mprotect.c:813
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f1176489279
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f11775b6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000149
RAX: ffffffffffffffda RBX: 00007f117659bf80 RCX: 00007f1176489279
RDX: 0000000000000007 RSI: 0000000000003000 RDI: 0000000020ffc000
RBP: 00007f11775b61d0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffdfb99454f R14: 00007f11775b6300 R15: 0000000000022000
 </TASK>

Allocated by task 3620:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:736 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x2d6/0x4c0 mm/slub.c:3268
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 dup_mmap+0x642/0x1070 kernel/fork.c:640
 dup_mm+0x91/0x370 kernel/fork.c:1520
 copy_mm kernel/fork.c:1569 [inline]
 copy_process+0x3ca8/0x7080 kernel/fork.c:2237
 kernel_clone+0xe7/0xab0 kernel/fork.c:2652
 __do_sys_clone+0xba/0x100 kernel/fork.c:2786
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Freed by task 30613:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
 kasan_set_track+0x21/0x30 mm/kasan/common.c:45
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x166/0x1c0 mm/kasan/common.c:328
 kasan_slab_free include/linux/kasan.h:200 [inline]
 slab_free_hook mm/slub.c:1754 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780
 slab_free mm/slub.c:3534 [inline]
 kmem_cache_free+0xeb/0x5b0 mm/slub.c:3551
 __vma_adjust+0x9ab/0x1900 mm/mmap.c:889
 vma_merge+0x590/0x870 mm/mmap.c:1122
 mprotect_fixup+0x338/0x960 mm/mprotect.c:595
 do_mprotect_pkey+0x70f/0xa80 mm/mprotect.c:781
 __do_sys_pkey_mprotect mm/mprotect.c:816 [inline]
 __se_sys_pkey_mprotect mm/mprotect.c:813 [inline]
 __x64_sys_pkey_mprotect+0x93/0xf0 mm/mprotect.c:813
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

The buggy address belongs to the object at ffff8880797e46c0
 which belongs to the cache vm_area_struct of size 152
The buggy address is located 0 bytes inside of
 152-byte region [ffff8880797e46c0, ffff8880797e4758)

The buggy address belongs to the physical page:
page:ffffea0001e5f900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x797e4
memcg:ffff888077759101
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea000140c240 dead000000000008 ffff8880119dab40
raw: 0000000000000000 0000000000120012 00000001ffffffff ffff888077759101
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 3664, tgid 3664 (syz-executor.4), ts 1292449465431, free_ts 1292446373756
 prep_new_page mm/page_alloc.c:2535 [inline]
 get_page_from_freelist+0x210d/0x3a30 mm/page_alloc.c:4282
 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5506
 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1824 [inline]
 allocate_slab+0x27e/0x3d0 mm/slub.c:1969
 new_slab mm/slub.c:2029 [inline]
 ___slab_alloc+0x89d/0xef0 mm/slub.c:3031
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118
 slab_alloc_node mm/slub.c:3209 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x3fb/0x4c0 mm/slub.c:3268
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 dup_mmap+0x642/0x1070 kernel/fork.c:640
 dup_mm+0x91/0x370 kernel/fork.c:1520
 copy_mm kernel/fork.c:1569 [inline]
 copy_process+0x3ca8/0x7080 kernel/fork.c:2237
 kernel_clone+0xe7/0xab0 kernel/fork.c:2652
 __do_sys_clone+0xba/0x100 kernel/fork.c:2786
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1453 [inline]
 free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1503
 free_unref_page_prepare mm/page_alloc.c:3383 [inline]
 free_unref_page+0x19/0x4d0 mm/page_alloc.c:3479
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2548
 qlink_free mm/kasan/quarantine.c:168 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294
 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:224 [inline]
 slab_post_alloc_hook mm/slab.h:736 [inline]
 slab_alloc_node mm/slub.c:3243 [inline]
 slab_alloc mm/slub.c:3251 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3258 [inline]
 kmem_cache_alloc+0x2d6/0x4c0 mm/slub.c:3268
 vm_area_dup+0x81/0x380 kernel/fork.c:466
 dup_mmap+0x642/0x1070 kernel/fork.c:640
 dup_mm+0x91/0x370 kernel/fork.c:1520
 copy_mm kernel/fork.c:1569 [inline]
 copy_process+0x3ca8/0x7080 kernel/fork.c:2237
 kernel_clone+0xe7/0xab0 kernel/fork.c:2652
 __do_sys_clone+0xba/0x100 kernel/fork.c:2786
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

Memory state around the buggy address:
 ffff8880797e4580: fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00
 ffff8880797e4600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880797e4680: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
                                           ^
 ffff8880797e4700: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff8880797e4780: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
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