loop0: detected capacity change from 0 to 256 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= exfat: Deprecated parameter 'namecase' exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0x1cbb3694, utbl_chksum : 0xe619d30d) exFAT-fs (loop0): error, in sector 160, dentry 5 should be unused, but 0xc1 ================================================================== BUG: KASAN: slab-use-after-free in lookup_bh_lru fs/buffer.c:1367 [inline] BUG: KASAN: slab-use-after-free in __find_get_block+0x4af/0x1150 fs/buffer.c:1394 Read of size 8 at addr ffff888012c451e8 by task syz.0.0/5316 CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted 6.13.0-rc4-syzkaller-00069-g8379578b11d5 #0 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 lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x169/0x550 mm/kasan/report.c:489 kasan_report+0x143/0x180 mm/kasan/report.c:602 lookup_bh_lru fs/buffer.c:1367 [inline] __find_get_block+0x4af/0x1150 fs/buffer.c:1394 sb_find_get_block include/linux/buffer_head.h:398 [inline] exfat_dir_readahead fs/exfat/dir.c:642 [inline] exfat_get_dentry+0x369/0x730 fs/exfat/dir.c:670 exfat_find_dir_entry+0x56a/0x29c0 fs/exfat/dir.c:1028 exfat_find fs/exfat/namei.c:629 [inline] exfat_lookup+0x810/0x1e70 fs/exfat/namei.c:727 lookup_open fs/namei.c:3627 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x11a7/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2064f85d29 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:00007f20649fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f2065175fa0 RCX: 00007f2064f85d29 RDX: 0000000000105042 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007f2065001b08 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000001db R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2065175fa0 R15: 00007fff73a00208 Allocated by task 5316: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3015 folio_alloc_buffers+0x31f/0x640 fs/buffer.c:924 grow_dev_folio fs/buffer.c:1064 [inline] grow_buffers fs/buffer.c:1105 [inline] __getblk_slow fs/buffer.c:1131 [inline] bdev_getblk+0x2af/0x670 fs/buffer.c:1431 __breadahead+0x2b/0x240 fs/buffer.c:1440 sb_breadahead include/linux/buffer_head.h:358 [inline] exfat_dir_readahead fs/exfat/dir.c:647 [inline] exfat_get_dentry+0x464/0x730 fs/exfat/dir.c:670 exfat_create_upcase_table+0x242/0xf60 fs/exfat/nls.c:758 __exfat_fill_super fs/exfat/super.c:628 [inline] exfat_fill_super+0x1196/0x2920 fs/exfat/super.c:678 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5316: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2353 [inline] slab_free mm/slub.c:4613 [inline] kmem_cache_free+0x195/0x410 mm/slub.c:4715 free_buffer_head+0x54/0x240 fs/buffer.c:3031 try_to_free_buffers+0x2fa/0x3b0 fs/buffer.c:2972 shrink_folio_list+0x241e/0x5ca0 mm/vmscan.c:1433 evict_folios+0x3c86/0x5800 mm/vmscan.c:4593 try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789 shrink_one+0x3b9/0x850 mm/vmscan.c:4834 shrink_many mm/vmscan.c:4897 [inline] lru_gen_shrink_node mm/vmscan.c:4975 [inline] shrink_node+0x37c5/0x3e50 mm/vmscan.c:5956 shrink_zones mm/vmscan.c:6215 [inline] do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6277 try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6527 __perform_reclaim mm/page_alloc.c:3929 [inline] __alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3951 __alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4382 __alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4766 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 folio_alloc_mpol_noprof+0x36/0x50 mm/mempolicy.c:2287 shmem_alloc_folio mm/shmem.c:1798 [inline] shmem_alloc_and_add_folio+0x4a0/0x1080 mm/shmem.c:1837 shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2357 shmem_get_folio mm/shmem.c:2463 [inline] shmem_write_begin+0x165/0x350 mm/shmem.c:3119 generic_perform_write+0x346/0x990 mm/filemap.c:4055 shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3295 new_sync_write fs/read_write.c:586 [inline] vfs_write+0xaeb/0xd30 fs/read_write.c:679 ksys_write+0x18f/0x2b0 fs/read_write.c:731 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888012c451d0 which belongs to the cache buffer_head of size 168 The buggy address is located 24 bytes inside of freed 168-byte region [ffff888012c451d0, ffff888012c45278) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12c45 memcg:ffff888000223a01 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c2eadc0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000110011 00000001f5000000 ffff888000223a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52810(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_RECLAIMABLE), pid 5316, tgid 5315 (syz.0.0), ts 69189616209, free_ts 41366811191 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1558 prep_new_page mm/page_alloc.c:1566 [inline] get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3476 __alloc_pages_slowpath+0x414/0x1020 mm/page_alloc.c:4288 __alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4766 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269 alloc_slab_page+0x6a/0x110 mm/slub.c:2423 allocate_slab+0x5a/0x2b0 mm/slub.c:2589 new_slab mm/slub.c:2642 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3830 __slab_alloc+0x58/0xa0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4175 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3015 folio_alloc_buffers+0x31f/0x640 fs/buffer.c:924 grow_dev_folio fs/buffer.c:1064 [inline] grow_buffers fs/buffer.c:1105 [inline] __getblk_slow fs/buffer.c:1131 [inline] bdev_getblk+0x2af/0x670 fs/buffer.c:1431 __breadahead+0x2b/0x240 fs/buffer.c:1440 sb_breadahead include/linux/buffer_head.h:358 [inline] exfat_dir_readahead fs/exfat/dir.c:647 [inline] exfat_get_dentry+0x464/0x730 fs/exfat/dir.c:670 exfat_create_upcase_table+0x242/0xf60 fs/exfat/nls.c:758 page last free pid 8 tgid 8 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2659 vfree+0x1c3/0x360 mm/vmalloc.c:3383 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3303 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff888012c45080: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb ffff888012c45100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888012c45180: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ^ ffff888012c45200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ffff888012c45280: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb ==================================================================