loop0: detected capacity change from 0 to 2048 UDF-fs: warning (device loop0): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 512 failed UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=1684, nr_sectors = 2 limit=64 ================================================================== BUG: KASAN: use-after-free in crc_itu_t+0x1b1/0x290 lib/crc/crc-itu-t.c:61 Read of size 1 at addr ffff88804cec4000 by task syz.0.0/5354 CPU: 0 UID: 0 PID: 5354 Comm: syz.0.0 Not tainted 6.16.0-syzkaller-11579-g35a813e010b9 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 crc_itu_t+0x1b1/0x290 lib/crc/crc-itu-t.c:61 udf_update_tag+0x7a/0x6f0 fs/udf/misc.c:261 udf_write_aext+0x4c3/0x7b0 fs/udf/inode.c:2187 udf_do_extend_file+0x322/0x1180 fs/udf/inode.c:561 udf_extend_file fs/udf/inode.c:712 [inline] udf_setsize+0xb78/0x1000 fs/udf/inode.c:1300 udf_setattr+0x3a1/0x5a0 fs/udf/file.c:236 notify_change+0xb33/0xe40 fs/attr.c:552 do_truncate+0x1a4/0x220 fs/open.c:68 vfs_truncate+0x493/0x520 fs/open.c:118 do_sys_truncate+0xdb/0x190 fs/open.c:141 __do_sys_truncate fs/open.c:153 [inline] __se_sys_truncate fs/open.c:151 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:151 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f210b58eb69 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f210c457038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f210b7b5fa0 RCX: 00007f210b58eb69 RDX: 0000000000000000 RSI: 000000400000f000 RDI: 0000200000000080 RBP: 00007f210b611df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f210b7b5fa0 R15: 00007fffe87d6168 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f6294a48 pfn:0x4cec4 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000000000 ffffea00013369c8 ffffea0001336988 0000000000000000 raw: 00000007f6294a48 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_ZERO|__GFP_COMP), pid 5328, tgid 5328 (udevd), ts 74622897287, free_ts 74639864917 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline] vma_alloc_folio_noprof+0xe4/0x200 mm/mempolicy.c:2470 folio_prealloc+0x30/0x180 mm/memory.c:-1 alloc_anon_folio mm/memory.c:4997 [inline] do_anonymous_page mm/memory.c:5054 [inline] do_pte_missing mm/memory.c:4232 [inline] handle_pte_fault mm/memory.c:6052 [inline] __handle_mm_fault+0x2ab9/0x5440 mm/memory.c:6195 handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364 do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 page last free pid 5328 tgid 5328 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] free_unref_folios+0xdbd/0x1520 mm/page_alloc.c:2952 folios_put_refs+0x559/0x640 mm/swap.c:997 folios_put include/linux/mm.h:1417 [inline] folio_batch_move_lru+0x319/0x3a0 mm/swap.c:175 lru_add_drain_cpu+0x119/0x880 mm/swap.c:647 lru_add_drain+0x122/0x3e0 mm/swap.c:735 __folio_batch_release+0x48/0x90 mm/swap.c:1054 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x49e/0x14b0 mm/shmem.c:1132 shmem_truncate_range mm/shmem.c:1244 [inline] shmem_evict_inode+0x272/0xa70 mm/shmem.c:1372 evict+0x504/0x9c0 fs/inode.c:810 __dentry_kill+0x209/0x660 fs/dcache.c:669 dput+0x19f/0x2b0 fs/dcache.c:911 do_renameat2+0x6de/0xa80 fs/namei.c:5280 __do_sys_rename fs/namei.c:5325 [inline] __se_sys_rename fs/namei.c:5323 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5323 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88804cec3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804cec3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804cec4000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88804cec4080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804cec4100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================