================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x131b/0x13e0 fs/ext4/namei.c:1246 Read of size 1 at addr ffff88810e822535 by task syz-executor/416 CPU: 0 PID: 416 Comm: syz-executor Not tainted 5.15.178-syzkaller-00013-g7d1f9b5c2ff5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 ext4_htree_fill_tree+0x131b/0x13e0 fs/ext4/namei.c:1246 ext4_dx_readdir fs/ext4/dir.c:606 [inline] ext4_readdir+0x2f75/0x3960 fs/ext4/dir.c:142 iterate_dir+0x265/0x600 __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 x64_sys_call+0x5ae/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fda2d2bfad3 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 72 3e 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:00007ffd6ccefbe8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555556bcd4e0 RCX: 00007fda2d2bfad3 RDX: 0000000000008000 RSI: 0000555556bcd4e0 RDI: 0000000000000005 RBP: 0000555556bcd4b4 R08: 0000000000028b61 R09: 0000000000000000 R10: 00007fda2d47cca0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 0000555556bcd4b0 R15: 00007ffd6ccf1ea0 Allocated by task 83: 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+0xb1/0xe0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255 kmem_cache_zalloc include/linux/slab.h:723 [inline] lsm_file_alloc security/security.c:574 [inline] security_file_alloc+0x29/0x120 security/security.c:1531 __alloc_file+0xb2/0x2a0 fs/file_table.c:106 alloc_empty_file+0x95/0x180 fs/file_table.c:150 path_openat+0xfe/0x2f40 fs/namei.c:3728 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13f/0x820 fs/open.c:1234 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1261 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 83: 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+0x126/0x160 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:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3521 [inline] kmem_cache_free+0x115/0x330 mm/slub.c:3539 security_file_free+0xc6/0xe0 security/security.c:1550 file_free fs/file_table.c:55 [inline] __fput+0x5d7/0x8c0 fs/file_table.c:293 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88810e822520 which belongs to the cache lsm_file_cache of size 16 The buggy address is located 5 bytes to the right of 16-byte region [ffff88810e822520, ffff88810e822530) The buggy address belongs to the page: page:ffffea00043a0880 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810e822300 pfn:0x10e822 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00046876c0 0000000300000003 ffff888100187080 raw: ffff88810e822300 000000008080005b 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 222, ts 12148981146, free_ts 12146367089 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780 allocate_slab mm/slub.c:1932 [inline] new_slab+0x9a/0x4e0 mm/slub.c:1995 ___slab_alloc+0x39e/0x830 mm/slub.c:3028 __slab_alloc+0x4a/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0x139/0x250 mm/slub.c:3255 kmem_cache_zalloc include/linux/slab.h:723 [inline] lsm_file_alloc security/security.c:574 [inline] security_file_alloc+0x29/0x120 security/security.c:1531 __alloc_file+0xb2/0x2a0 fs/file_table.c:106 alloc_empty_file+0x95/0x180 fs/file_table.c:150 path_openat+0xfe/0x2f40 fs/namei.c:3728 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13f/0x820 fs/open.c:1234 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1261 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page_list+0x14b/0xa60 mm/page_alloc.c:3671 release_pages+0x1310/0x1370 mm/swap.c:1009 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:320 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:338 exit_mmap+0x484/0x990 mm/mmap.c:3236 __mmput+0x95/0x310 kernel/fork.c:1180 mmput+0x5b/0x170 kernel/fork.c:1203 exec_mmap+0x46b/0x510 fs/exec.c:1047 begin_new_exec+0xbcf/0x1f40 fs/exec.c:1306 load_elf_binary+0x945/0x2750 fs/binfmt_elf.c:1001 search_binary_handler fs/exec.c:1755 [inline] exec_binprm fs/exec.c:1796 [inline] bprm_execve+0x7ae/0x14a0 fs/exec.c:1865 do_execveat_common+0x565/0x710 fs/exec.c:1970 do_execve fs/exec.c:2040 [inline] __do_sys_execve fs/exec.c:2116 [inline] __se_sys_execve fs/exec.c:2111 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2111 x64_sys_call+0x1c5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88810e822400: fb fb fc fc fa fb fc fc fb fb fc fc fa fb fc fc ffff88810e822480: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc >ffff88810e822500: fa fb fc fc fa fb fc fc fa fb fc fc fb fb fc fc ^ ffff88810e822580: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc ffff88810e822600: fa fb fc fc fa fb fc fc fa fb fc fc fa fb fc fc ==================================================================