================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1220 Read of size 1 at addr ffff88811e6eea67 by task syz-executor276/279 CPU: 0 PID: 279 Comm: syz-executor276 Not tainted 5.10.221-syzkaller-01371-g1240968f7644 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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:1220 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: 0033:0x7f21159190f3 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 42 49 fb 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 b8 ff ff ff f7 d8 RSP: 002b:00007ffc549d7a48 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555555a00830 RCX: 00007f21159190f3 RDX: 0000000000008000 RSI: 0000555555a00830 RDI: 0000000000000004 RBP: 0000555555a00804 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8 R13: 0000000000000010 R14: 0000555555a00800 R15: 00007ffc549d9cc0 Allocated by task 244: 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 dup_mmap kernel/fork.c:550 [inline] dup_mm kernel/fork.c:1435 [inline] copy_mm+0x8ac/0x13a0 kernel/fork.c:1491 copy_process+0x1175/0x3340 kernel/fork.c:2183 kernel_clone+0x21e/0x9e0 kernel/fork.c:2574 __do_sys_clone kernel/fork.c:2700 [inline] __se_sys_clone kernel/fork.c:2684 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2684 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 255: 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] exit_mmap+0x494/0x5c0 mm/mmap.c:3363 __mmput+0x95/0x2d0 kernel/fork.c:1153 mmput+0x59/0x170 kernel/fork.c:1176 exec_mmap fs/exec.c:1042 [inline] begin_new_exec+0xc70/0x2380 fs/exec.c:1289 load_elf_binary+0x945/0x2750 fs/binfmt_elf.c:998 search_binary_handler fs/exec.c:1722 [inline] exec_binprm fs/exec.c:1763 [inline] bprm_execve+0x81b/0x1600 fs/exec.c:1839 do_execveat_common+0x959/0xac0 fs/exec.c:1950 do_execve fs/exec.c:2020 [inline] __do_sys_execve fs/exec.c:2096 [inline] __se_sys_execve fs/exec.c:2091 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2091 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88811e6ee940 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 [ffff88811e6ee940, ffff88811e6eea28) The buggy address belongs to the page: page:ffffea000479bb80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11e6ee flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100190480 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 244, ts 15911124041, free_ts 0 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_dup+0x26/0x270 kernel/fork.c:366 dup_mmap kernel/fork.c:550 [inline] dup_mm kernel/fork.c:1435 [inline] copy_mm+0x8ac/0x13a0 kernel/fork.c:1491 copy_process+0x1175/0x3340 kernel/fork.c:2183 kernel_clone+0x21e/0x9e0 kernel/fork.c:2574 __do_sys_clone kernel/fork.c:2700 [inline] __se_sys_clone kernel/fork.c:2684 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2684 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb page_owner free stack trace missing Memory state around the buggy address: ffff88811e6ee900: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88811e6ee980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811e6eea00: fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb fb ^ ffff88811e6eea80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811e6eeb00: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ==================================================================