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BUG: KASAN: use-after-free in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221
Read of size 1 at addr ffff8881172bea67 by task syz-executor/499

CPU: 1 PID: 499 Comm: syz-executor Not tainted 5.10.226-syzkaller-1003431-ge5e5644ea27f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221
 ext4_dx_readdir fs/ext4/dir.c:598 [inline]
 ext4_readdir+0x2dde/0x37c0 fs/ext4/dir.c:142
 iterate_dir+0x265/0x580
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354
 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f366bb2c0d3
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 52 43 f8 ff 66 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 a8 ff ff ff f7 d8
RSP: 002b:00007fffc4d349f8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055558a8fb4e0 RCX: 00007f366bb2c0d3
RDX: 0000000000008000 RSI: 000055558a8fb4e0 RDI: 0000000000000005
RBP: 000055558a8fb4b4 R08: 0000000000028b61 R09: 0000000000000000
R10: 00007f366bc86ca0 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000010 R14: 000055558a8fb4b0 R15: 00007fffc4d36ca0

Allocated by task 266:
 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:430 [inline]
 __kasan_slab_alloc+0xb1/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x61/0x2f0 mm/slab.h:583
 slab_alloc_node mm/slub.c:2947 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x168/0x2e0 mm/slub.c:2960
 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bio_alloc_bioset+0x1e0/0x650 block/bio.c:486
 bio_alloc include/linux/bio.h:412 [inline]
 ext4_mpage_readpages+0x10e0/0x2180 fs/ext4/readpage.c:413
 ext4_readahead+0xe2/0x110 fs/ext4/inode.c:3351
 read_pages+0x17e/0xbf0 mm/readahead.c:140
 page_cache_ra_unbounded+0x6be/0x890 mm/readahead.c:248
 do_page_cache_ra mm/readahead.c:277 [inline]
 ondemand_readahead+0x863/0xc60 mm/readahead.c:559
 page_cache_sync_ra+0x26c/0x2c0 mm/readahead.c:587
 page_cache_sync_readahead include/linux/pagemap.h:837 [inline]
 generic_file_buffered_read+0x6da/0x2ad0 mm/filemap.c:2250
 generic_file_read_iter+0x107/0x6b0 mm/filemap.c:2568
 ext4_file_read_iter+0x287/0x4d0
 call_read_iter include/linux/fs.h:2015 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x990/0xba0 fs/read_write.c:496
 ksys_read+0x199/0x2c0 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x7b/0x90 fs/read_write.c:642
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Freed by task 0:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x121/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1595 [inline]
 slab_free_freelist_hook+0xc0/0x190 mm/slub.c:1621
 slab_free mm/slub.c:3203 [inline]
 kmem_cache_free+0xa9/0x1e0 mm/slub.c:3219
 mempool_free_slab+0x1d/0x30 mm/mempool.c:520
 mempool_free+0xd7/0x310 mm/mempool.c:502
 bio_free+0x157/0x1a0 block/bio.c:266
 bio_put+0xca/0x120
 __read_end_io+0x41b/0x450 fs/ext4/readpage.c:92
 mpage_end_io+0x93/0x5f0
 bio_endio+0x520/0x6a0 block/bio.c:1458
 req_bio_endio block/blk-core.c:263 [inline]
 blk_update_request+0x6e9/0x12b0 block/blk-core.c:1468
 scsi_end_request+0x90/0x810 drivers/scsi/scsi_lib.c:570
 scsi_io_completion+0x1cb/0x480 drivers/scsi/scsi_lib.c:967
 scsi_finish_command+0x3b0/0x500 drivers/scsi/scsi.c:205
 scsi_softirq_done+0x13f/0x340 drivers/scsi/scsi_lib.c:1442
 blk_done_softirq+0x345/0x3d0 block/blk-mq.c:593
 __do_softirq+0x268/0x5bb kernel/softirq.c:309

The buggy address belongs to the object at ffff8881172bea00
 which belongs to the cache bio-0 of size 216
The buggy address is located 103 bytes inside of
 216-byte region [ffff8881172bea00, ffff8881172bead8)
The buggy address belongs to the page:
page:ffffea00045caf80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1172be
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888107fe4f00
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 0x92880(GFP_NOWAIT|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC), pid 180, ts 5531318526, free_ts 5476185098
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x166/0x180 mm/page_alloc.c:2462
 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348
 allocate_slab mm/slub.c:1808 [inline]
 new_slab+0x80/0x400 mm/slub.c:1869
 new_slab_objects mm/slub.c:2627 [inline]
 ___slab_alloc+0x302/0x4b0 mm/slub.c:2791
 __slab_alloc+0x63/0xa0 mm/slub.c:2831
 slab_alloc_node mm/slub.c:2913 [inline]
 slab_alloc mm/slub.c:2955 [inline]
 kmem_cache_alloc+0x1b9/0x2e0 mm/slub.c:2960
 mempool_alloc_slab+0x1d/0x30 mm/mempool.c:513
 mempool_alloc+0x11f/0x530 mm/mempool.c:393
 bio_alloc_bioset+0x1e0/0x650 block/bio.c:486
 bio_alloc include/linux/bio.h:412 [inline]
 ext4_mpage_readpages+0x10e0/0x2180 fs/ext4/readpage.c:413
 ext4_readahead+0xe2/0x110 fs/ext4/inode.c:3351
 read_pages+0x17e/0xbf0 mm/readahead.c:140
 page_cache_ra_unbounded+0x345/0x890
 do_page_cache_ra+0xf5/0x110 mm/readahead.c:277
 do_sync_mmap_readahead mm/filemap.c:2668 [inline]
 filemap_fault+0x1529/0x2660 mm/filemap.c:2811
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:28 [inline]
 free_pages_prepare mm/page_alloc.c:1349 [inline]
 free_pcp_prepare mm/page_alloc.c:1421 [inline]
 free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336
 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443
 release_pages+0xea0/0xef0 mm/swap.c:1103
 free_pages_and_swap_cache+0x8a/0xa0 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 mm/mmu_gather.c:247 [inline]
 tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:326
 exit_mmap+0x312/0x5c0 mm/mmap.c:3357
 __mmput+0x95/0x2d0 kernel/fork.c:1153
 mmput+0x59/0x170 kernel/fork.c:1176
 exit_mm kernel/exit.c:539 [inline]
 do_exit+0xbda/0x2a50 kernel/exit.c:850
 do_group_exit+0x141/0x310 kernel/exit.c:985
 __do_sys_exit_group kernel/exit.c:996 [inline]
 __se_sys_exit_group kernel/exit.c:994 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:994
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb

Memory state around the buggy address:
 ffff8881172be900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881172be980: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881172bea00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff8881172bea80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
 ffff8881172beb00: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
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