================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221 Read of size 1 at addr ffff8881164b9a67 by task syz-executor/502 CPU: 0 PID: 502 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: 0033:0x7f51407430d3 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:00007fffe4cd1978 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555560f884e0 RCX: 00007f51407430d3 RDX: 0000000000008000 RSI: 0000555560f884e0 RDI: 0000000000000005 RBP: 0000555560f884b4 R08: 0000000000028b61 R09: 0000000000000000 R10: 00007f514089dca0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 0000555560f884b0 R15: 00007fffe4cd3c20 Allocated by task 156: 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 vm_area_dup+0x26/0x270 kernel/fork.c:366 __split_vma+0xc0/0x420 mm/mmap.c:2871 __do_munmap+0x412/0x8c0 mm/mmap.c:2998 do_munmap mm/mmap.c:3052 [inline] munmap_vma_range mm/mmap.c:639 [inline] mmap_region+0x8de/0x1af0 mm/mmap.c:1823 do_mmap+0x800/0xeb0 mm/mmap.c:1650 vm_mmap_pgoff+0x201/0x390 mm/util.c:543 ksys_mmap_pgoff+0x16f/0x1f0 mm/mmap.c:1701 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 156: 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 vm_area_free+0x52/0xf0 kernel/fork.c:386 __free_vma mm/mmap.c:179 [inline] put_vma mm/mmap.c:186 [inline] remove_vma mm/mmap.c:205 [inline] remove_vma_list+0x32d/0x3c0 mm/mmap.c:2769 __do_munmap+0x6a4/0x8c0 mm/mmap.c:3044 do_munmap mm/mmap.c:3052 [inline] munmap_vma_range mm/mmap.c:639 [inline] mmap_region+0x8de/0x1af0 mm/mmap.c:1823 do_mmap+0x800/0xeb0 mm/mmap.c:1650 vm_mmap_pgoff+0x201/0x390 mm/util.c:543 ksys_mmap_pgoff+0x16f/0x1f0 mm/mmap.c:1701 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff8881164b9940 which belongs to the cache vm_area_struct of size 232 The buggy address is located 63 bytes to the right of 232-byte region [ffff8881164b9940, ffff8881164b9a28) The buggy address belongs to the page: page:ffffea0004592e40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1164b9 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100190000 raw: 0000000000000000 00000000000d000d 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 156, ts 6297005646, free_ts 6293374533 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 vm_area_alloc+0x24/0x160 kernel/fork.c:358 mmap_region+0xac8/0x1af0 mm/mmap.c:1848 do_mmap+0x800/0xeb0 mm/mmap.c:1650 vm_mmap_pgoff+0x201/0x390 mm/util.c:543 ksys_mmap_pgoff+0x16f/0x1f0 mm/mmap.c:1701 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:95 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb 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: ffff8881164b9900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff8881164b9980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881164b9a00: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb ^ ffff8881164b9a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881164b9b00: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ==================================================================