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BUG: KASAN: use-after-free in ext4_ext_rm_leaf fs/ext4/extents.c:2623 [inline]
BUG: KASAN: use-after-free in ext4_ext_remove_space+0x2ce0/0x4058 fs/ext4/extents.c:2961
Read of size 4 at addr ffff0000f7ebd6a0 by task syz.0.168/7330

CPU: 0 UID: 0 PID: 7330 Comm: syz.0.168 Not tainted 6.14.0-rc3-syzkaller-ga1c24ab82279 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:489
 kasan_report+0xd8/0x138 mm/kasan/report.c:602
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 ext4_ext_rm_leaf fs/ext4/extents.c:2623 [inline]
 ext4_ext_remove_space+0x2ce0/0x4058 fs/ext4/extents.c:2961
 ext4_ext_truncate+0x134/0x1d4 fs/ext4/extents.c:4466
 ext4_truncate+0x9dc/0x10ac fs/ext4/inode.c:4217
 ext4_setattr+0xdc8/0x173c fs/ext4/inode.c:5542
 notify_change+0x9f0/0xca0 fs/attr.c:552
 do_truncate+0x1c0/0x28c fs/open.c:65
 handle_truncate fs/namei.c:3451 [inline]
 do_open fs/namei.c:3834 [inline]
 path_openat+0x249c/0x2b1c fs/namei.c:3989
 do_filp_open+0x1e8/0x404 fs/namei.c:4016
 do_sys_openat2+0x124/0x1b8 fs/open.c:1428
 do_sys_open fs/open.c:1443 [inline]
 __do_sys_openat fs/open.c:1459 [inline]
 __se_sys_openat fs/open.c:1454 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1454
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x122 pfn:0x137ebd
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000122 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f7ebd580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7ebd600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff0000f7ebd680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff0000f7ebd700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff0000f7ebd780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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