================================================================== BUG: KASAN: use-after-free in crc16+0x235/0x2d0 lib/crc16.c:58 Read of size 1 at addr ffff8881118ef000 by task syz-executor.5/26024 CPU: 1 PID: 26024 Comm: syz-executor.5 Not tainted 5.10.161-syzkaller-00019-g416c4356f372 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3c0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x1a4/0x1f0 mm/kasan/report.c:436 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 crc16+0x235/0x2d0 lib/crc16.c:58 ext4_group_desc_csum+0x851/0xb50 fs/ext4/super.c:2850 ext4_group_desc_csum_set+0x1d6/0x270 fs/ext4/super.c:2873 ext4_free_blocks+0x1b9e/0x2ad0 fs/ext4/mballoc.c:5527 ext4_remove_blocks+0xaf1/0x1180 fs/ext4/extents.c:2520 ext4_ext_rm_leaf+0xaa8/0x18c0 fs/ext4/extents.c:2704 ext4_ext_remove_space+0xf25/0x22a0 fs/ext4/extents.c:2952 ext4_ext_truncate+0x18a/0x210 fs/ext4/extents.c:4413 ext4_truncate+0xba0/0x1270 fs/ext4/inode.c:4356 ext4_evict_inode+0xf1e/0x1730 fs/ext4/inode.c:288 evict+0x2a3/0x6c0 fs/inode.c:577 iput_final fs/inode.c:1655 [inline] iput+0x61f/0x7d0 fs/inode.c:1681 do_unlinkat+0x51a/0x920 fs/namei.c:3982 __do_sys_unlink fs/namei.c:4022 [inline] __se_sys_unlink fs/namei.c:4020 [inline] __x64_sys_unlink+0x49/0x50 fs/namei.c:4020 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7ff91b0190f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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:00007ff919d8c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007ff91b138f80 RCX: 00007ff91b0190f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 00007ff91b074ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc24281baf R14: 00007ff919d8c300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea0004463bc0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1118ef flags: 0x8000000000000000() raw: 8000000000000000 ffffea00045f3788 ffffea0005744208 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Unmovable, gfp_mask 0x500dc0(GFP_USER|__GFP_ZERO|__GFP_ACCOUNT), pid 388, ts 1150062470649, free_ts 1150101523627 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2386 [inline] prep_new_page mm/page_alloc.c:2392 [inline] get_page_from_freelist+0x755/0x810 mm/page_alloc.c:4073 __alloc_pages_nodemask+0x3b6/0x890 mm/page_alloc.c:5160 __alloc_pages include/linux/gfp.h:529 [inline] __alloc_pages_node include/linux/gfp.h:542 [inline] alloc_pages_node include/linux/gfp.h:556 [inline] alloc_pages include/linux/gfp.h:575 [inline] __pte_alloc_one include/asm-generic/pgalloc.h:63 [inline] pte_alloc_one+0x1f/0xc0 arch/x86/mm/pgtable.c:33 __pte_alloc+0x75/0x2b0 mm/memory.c:462 copy_pte_range+0xe7b/0xf80 mm/memory.c:991 copy_pmd_range mm/memory.c:1109 [inline] copy_pud_range mm/memory.c:1146 [inline] copy_p4d_range mm/memory.c:1170 [inline] copy_page_range+0xc2d/0x10a0 mm/memory.c:1243 dup_mmap+0xab4/0xf60 kernel/fork.c:611 dup_mm+0x91/0x320 kernel/fork.c:1412 copy_mm+0x108/0x1b0 kernel/fork.c:1468 copy_process+0x133a/0x33a0 kernel/fork.c:2152 kernel_clone+0x22d/0x900 kernel/fork.c:2524 __do_sys_clone kernel/fork.c:2643 [inline] __se_sys_clone kernel/fork.c:2627 [inline] __x64_sys_clone+0x271/0x2e0 kernel/fork.c:2627 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1332 [inline] free_pcp_prepare+0x18c/0x1c0 mm/page_alloc.c:1406 free_unref_page_prepare mm/page_alloc.c:3293 [inline] free_unref_page_list+0x11d/0x660 mm/page_alloc.c:3367 release_pages+0xc24/0xc60 mm/swap.c:1082 free_pages_and_swap_cache+0x97/0xb0 mm/swap_state.c:356 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu+0x8a0/0xa80 mm/mmu_gather.c:247 tlb_finish_mmu+0xd2/0x1f0 mm/mmu_gather.c:326 exit_mmap+0x319/0x5c0 mm/mmap.c:3343 __mmput+0x95/0x2c0 kernel/fork.c:1133 mmput+0x4b/0x50 kernel/fork.c:1154 exit_mm+0x5cd/0x790 kernel/exit.c:489 do_exit+0x5f2/0x2340 kernel/exit.c:800 do_group_exit+0x13a/0x300 kernel/exit.c:910 get_signal+0xe17/0x1440 kernel/signal.c:2780 arch_do_signal+0x8e/0x650 arch/x86/kernel/signal.c:805 exit_to_user_mode_loop+0xa3/0xe0 kernel/entry/common.c:161 exit_to_user_mode_prepare kernel/entry/common.c:191 [inline] syscall_exit_to_user_mode+0x77/0xa0 kernel/entry/common.c:266 Memory state around the buggy address: ffff8881118eef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881118eef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881118ef000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881118ef080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881118ef100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================