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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+0xbc8/0xde0 fs/ext4/extents.c:953
Read of size 4 at addr ffff88806de59070 by task syz-executor215/5064

CPU: 1 PID: 5064 Comm: syz-executor215 Not tainted 6.7.0-rc1-syzkaller-00139-g6bc40e44f1dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0x163/0x540 mm/kasan/report.c:475
 kasan_report+0x142/0x170 mm/kasan/report.c:588
 ext4_ext_binsearch fs/ext4/extents.c:837 [inline]
 ext4_find_extent+0xbc8/0xde0 fs/ext4/extents.c:953
 ext4_ext_map_blocks+0x2cb/0x7150 fs/ext4/extents.c:4101
 ext4_map_blocks+0xa2f/0x1cd0 fs/ext4/inode.c:621
 _ext4_get_block+0x238/0x6a0 fs/ext4/inode.c:763
 __block_write_begin_int+0x54d/0x1ad0 fs/buffer.c:2119
 block_page_mkwrite+0x1cc/0x300 fs/buffer.c:2634
 ext4_page_mkwrite+0x472/0xdf0 fs/ext4/inode.c:6159
 do_page_mkwrite+0x197/0x470 mm/memory.c:2943
 wp_page_shared mm/memory.c:3338 [inline]
 do_wp_page+0x1d07/0x4d40 mm/memory.c:3478
 handle_pte_fault mm/memory.c:5054 [inline]
 __handle_mm_fault mm/memory.c:5179 [inline]
 handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5344
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7fc26ea5118c
Code: 73 00 e9 59 f7 ff ff 66 c7 04 25 00 01 00 20 2e 00 e9 ee f7 ff ff b8 00 36 00 20 48 8d 35 54 d8 0a 00 b9 25 00 00 00 48 89 c7 <f3> 48 a5 0f b6 06 88 07 e9 fe f7 ff ff 50 b9 00 36 00 20 ba ac 04
RSP: 002b:00007ffd640ee610 EFLAGS: 00010246
RAX: 0000000020003600 RBX: 0000000020001b00 RCX: 0000000000000025
RDX: f5aaa111fc3d2afa RSI: 00007fc26eafe9d8 RDI: 0000000020003600
RBP: 00007ffd640ee6e8 R08: 00007fc26eadf207 R09: 00007fc26eadf207
R10: 00007ffd640ee6e8 R11: 0000000000000246 R12: 00007ffd640ee760
R13: 00007ffd640ee6f0 R14: 00007ffd640ee710 R15: 00007fc26eadf065
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001b79640 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6de59
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0001d0f588 ffffea0001b79608 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 5064, tgid 5064 (syz-executor215), ts 94572379866, free_ts 94586815274
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1544 [inline]
 get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312
 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568
 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133
 vma_alloc_folio+0xf3/0x3f0 mm/mempolicy.c:2172
 wp_page_copy mm/memory.c:3114 [inline]
 do_wp_page+0x1234/0x4d40 mm/memory.c:3510
 handle_pte_fault mm/memory.c:5054 [inline]
 __handle_mm_fault mm/memory.c:5179 [inline]
 handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5344
 do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1561
 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:1137 [inline]
 free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347
 free_unref_page_list+0x5a0/0x840 mm/page_alloc.c:2533
 release_pages+0x2117/0x2400 mm/swap.c:1042
 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:293 [inline]
 tlb_flush_mmu+0x34c/0x4e0 mm/mmu_gather.c:300
 tlb_finish_mmu+0xd4/0x1f0 mm/mmu_gather.c:392
 unmap_region+0x300/0x350 mm/mmap.c:2341
 do_vmi_align_munmap+0x1223/0x1860 mm/mmap.c:2657
 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2725
 __vm_munmap+0x230/0x450 mm/mmap.c:3012
 __do_sys_munmap mm/mmap.c:3029 [inline]
 __se_sys_munmap mm/mmap.c:3026 [inline]
 __x64_sys_munmap+0x69/0x80 mm/mmap.c:3026
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Memory state around the buggy address:
 ffff88806de58f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806de58f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806de59000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff88806de59080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806de59100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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