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BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:837 [inline]
BUG: KASAN: use-after-free in ext4_find_extent+0xbe8/0xce0 fs/ext4/extents.c:953
Read of size 4 at addr ffff888073f80070 by task syz-executor265/5021

CPU: 0 PID: 5021 Comm: syz-executor265 Not tainted 6.5.0-rc3-syzkaller-00123-g57012c57536f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 ext4_ext_binsearch fs/ext4/extents.c:837 [inline]
 ext4_find_extent+0xbe8/0xce0 fs/ext4/extents.c:953
 ext4_ext_map_blocks+0x26b/0x5b00 fs/ext4/extents.c:4101
 ext4_map_blocks+0x619/0x1770 fs/ext4/inode.c:621
 _ext4_get_block+0x24d/0x5a0 fs/ext4/inode.c:763
 __block_write_begin_int+0x3c0/0x1470 fs/buffer.c:2128
 block_page_mkwrite+0x3d9/0x4d0 fs/buffer.c:2651
 ext4_page_mkwrite+0xcff/0x1760 fs/ext4/inode.c:6116
 do_page_mkwrite+0x1a1/0x680 mm/memory.c:2942
 wp_page_shared mm/memory.c:3294 [inline]
 do_wp_page+0x3a0/0x3710 mm/memory.c:3376
 handle_pte_fault mm/memory.c:4955 [inline]
 __handle_mm_fault+0x1af7/0x3b80 mm/memory.c:5079
 handle_mm_fault+0x2ab/0x9d0 mm/memory.c:5233
 do_user_addr_fault+0x446/0xfc0 arch/x86/mm/fault.c:1392
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f649c1eb318
Code: 73 00 e9 e3 f7 ff ff 66 c7 04 25 00 01 00 20 2e 00 e9 05 f8 ff ff b8 00 36 00 20 48 8d 35 a8 c4 09 00 b9 25 00 00 00 48 89 c7 <f3> 48 a5 0f b6 06 88 07 e9 15 f8 ff ff 50 b9 00 36 00 20 ba ac 04
RSP: 002b:00007ffe22348910 EFLAGS: 00010246
RAX: 0000000020003600 RBX: 0000000000000000 RCX: 0000000000000025
RDX: 61981921d9549e4b RSI: 00007f649c2877b8 RDI: 0000000020003600
RBP: 0000000000000000 R08: 00007ffe22348940 R09: 00007ffe22348940
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe22348940
R13: 00007ffe22348bc8 R14: 431bde82d7b634db R15: 00007f649c26803b
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001cfe000 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x73f80
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0001cfe048 ffffea0001cfdfc8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5002, tgid 5002 (sshd), ts 39289875338, free_ts 39354485911
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 __folio_alloc+0x16/0x40 mm/page_alloc.c:4509
 vma_alloc_folio+0x156/0x890 mm/mempolicy.c:2240
 do_anonymous_page mm/memory.c:4104 [inline]
 do_pte_missing mm/memory.c:3662 [inline]
 handle_pte_fault mm/memory.c:4939 [inline]
 __handle_mm_fault+0x12a8/0x3b80 mm/memory.c:5079
 handle_mm_fault+0x2ab/0x9d0 mm/memory.c:5233
 do_user_addr_fault+0x2e7/0xfc0 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1486 [inline]
 exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1542
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x508/0xb90 mm/page_alloc.c:2348
 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2489
 release_pages+0x32a/0x14e0 mm/swap.c:1042
 tlb_batch_pages_flush+0x9a/0x190 mm/mmu_gather.c:97
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu mm/mmu_gather.c:299 [inline]
 tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391
 unmap_region+0x244/0x2e0 mm/mmap.c:2317
 do_vmi_align_munmap+0xe8e/0x1720 mm/mmap.c:2556
 do_vmi_munmap+0x20e/0x450 mm/mmap.c:2623
 __vm_munmap+0x144/0x390 mm/mmap.c:2905
 __do_sys_munmap mm/mmap.c:2922 [inline]
 __se_sys_munmap mm/mmap.c:2919 [inline]
 __x64_sys_munmap+0x62/0x80 mm/mmap.c:2919
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff888073f7ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888073f7ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888073f80000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff888073f80080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888073f80100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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