================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1085/0x10f0 fs/ext4/namei.c:1246 Read of size 1 at addr ffff8881322b7365 by task syz-executor/2029 CPU: 0 PID: 2029 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_htree_fill_tree+0x1085/0x10f0 fs/ext4/namei.c:1246 ext4_dx_readdir fs/ext4/dir.c:609 [inline] ext4_readdir+0x2c5f/0x3aa0 fs/ext4/dir.c:145 iterate_dir+0x25c/0x600 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x250 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 x64_sys_call+0x592/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc25d013e33 Code: c7 c0 e8 ff ff ff 64 c7 00 16 00 00 00 31 c0 eb 9e e8 81 9b fd ff 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 e8 ff ff ff f7 d8 RSP: 002b:00007ffdfb4b0378 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555576565920 RCX: 00007fc25d013e33 RDX: 0000000000008000 RSI: 0000555576565950 RDI: 0000000000000005 RBP: 0000555576565950 R08: 00000000000286f1 R09: 0000000000000001 R10: 00007fc25d1e7ca0 R11: 0000000000000293 R12: 0000555576565924 R13: ffffffffffffffe8 R14: 0000000000000010 R15: 00007ffdfb4b2620 Allocated by task 2056: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x167/0x4c0 mm/mempool.c:393 bio_alloc_bioset+0x124/0x910 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] submit_bh_wbc+0x1c2/0x680 fs/buffer.c:3028 submit_bh+0x2a/0x40 fs/buffer.c:3062 __ext4_read_bh fs/ext4/super.c:155 [inline] ext4_read_bh_nowait+0x18d/0x1c0 fs/ext4/super.c:167 __ext4_get_inode_loc+0x9c9/0xcb0 fs/ext4/inode.c:4457 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4478 [inline] __ext4_iget+0x448/0x3e80 fs/ext4/inode.c:4733 ext4_fill_super+0x6b8f/0x8bf0 fs/ext4/super.c:4863 mount_bdev+0x28d/0x3c0 fs/super.c:1411 ext4_mount+0x34/0x40 fs/ext4/super.c:6650 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1541 do_new_mount+0x251/0xb40 fs/namespace.c:3037 path_mount+0x640/0xff0 fs/namespace.c:3367 do_mount fs/namespace.c:3380 [inline] __do_sys_mount fs/namespace.c:3588 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3565 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 25: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kmem_cache_free+0x100/0x320 mm/slub.c:3544 mempool_free_slab+0x1d/0x30 mm/mempool.c:520 mempool_free+0xd5/0x330 mm/mempool.c:502 bio_free+0x255/0x360 block/bio.c:239 bio_put+0x91/0x610 block/bio.c:700 end_bio_bh_io_sync+0xc4/0x120 fs/buffer.c:3008 bio_endio+0x732/0x810 block/bio.c:1478 req_bio_endio block/blk-core.c:272 [inline] blk_update_request+0x75d/0x1030 block/blk-core.c:1463 blk_mq_end_request+0x41/0x80 block/blk-mq.c:582 lo_complete_rq+0x131/0x250 drivers/block/loop.c:530 blk_complete_reqs block/blk-mq.c:594 [inline] blk_done_softirq+0xff/0x140 block/blk-mq.c:599 handle_softirqs+0x250/0x560 kernel/softirq.c:583 run_ksoftirqd+0x28/0x40 kernel/softirq.c:959 smpboot_thread_fn+0x446/0x880 kernel/smpboot.c:164 kthread+0x3f5/0x4f0 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff8881322b7280 which belongs to the cache bio-224 of size 224 The buggy address is located 5 bytes to the right of 224-byte region [ffff8881322b7280, ffff8881322b7360) The buggy address belongs to the page: page:ffffea0004c8adc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1322b7 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 0000000100000001 ffff8881081aad80 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x192800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1934, ts 195234012112, free_ts 195228339473 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0x138/0x260 mm/slub.c:3260 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513 mempool_alloc+0x167/0x4c0 mm/mempool.c:393 bio_alloc_bioset+0x124/0x910 block/bio.c:469 bio_alloc include/linux/bio.h:429 [inline] submit_bh_wbc+0x1c2/0x680 fs/buffer.c:3028 submit_bh fs/buffer.c:3062 [inline] __sync_dirty_buffer+0x224/0x330 fs/buffer.c:3157 ext4_commit_super+0x30f/0x400 fs/ext4/super.c:5539 ext4_handle_error+0x4fe/0x760 fs/ext4/super.c:658 __ext4_error_file+0x2c2/0x5c0 fs/ext4/super.c:825 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 sock_alloc_inode+0x1b/0xb0 net/socket.c:303 alloc_inode fs/inode.c:264 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:1011 Memory state around the buggy address: ffff8881322b7200: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff8881322b7280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881322b7300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8881322b7380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff8881322b7400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0 EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0 EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0 EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0 EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0 EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0 EXT4-fs error (device loop8): htree_dirblock_to_tree:1112: inode #2: block 20: comm syz-executor: bad entry in directory: inode out of bounds - offset=1024, inode=2033530174, rec_len=1012, size=1024 fake=0