================================================================== BUG: KASAN: slab-out-of-bounds in ext4_htree_fill_tree+0x1316/0x13e0 fs/ext4/namei.c:1221 Read of size 1 at addr ffff888113d06a67 by task syz-executor/486 CPU: 0 PID: 486 Comm: syz-executor Not tainted 5.10.234-syzkaller-1006808-ge0b88ee5f09c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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 fs/readdir.c:-1 __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 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7ff4422c4bf3 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 f2 44 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:00007ffccd561188 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00005555793714e0 RCX: 00007ff4422c4bf3 RDX: 0000000000008000 RSI: 00005555793714e0 RDI: 0000000000000005 RBP: 00005555793714b4 R08: 0000000000028b61 R09: 0000000000000000 R10: 00007ff4423f1ca0 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000010 R14: 00005555793714b0 R15: 000000000000cdaf Allocated by task 432: 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_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x18a/0x2e0 mm/slub.c:2974 kmalloc include/linux/slab.h:552 [inline] get_mountpoint+0x1f1/0x3e0 fs/namespace.c:734 attach_recursive_mnt+0x179/0x1970 fs/namespace.c:2151 graft_tree+0x15a/0x1b0 fs/namespace.c:2274 do_loopback+0x3c7/0x520 fs/namespace.c:2389 path_mount+0x4cf/0xcb0 fs/namespace.c:3241 do_mount fs/namespace.c:3260 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 432: 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] kfree+0xc3/0x270 mm/slub.c:4191 __put_mountpoint+0x1c7/0x220 fs/namespace.c:780 put_mountpoint fs/namespace.c:787 [inline] attach_recursive_mnt+0x15ea/0x1970 fs/namespace.c:2201 graft_tree+0x15a/0x1b0 fs/namespace.c:2274 do_loopback+0x3c7/0x520 fs/namespace.c:2389 path_mount+0x4cf/0xcb0 fs/namespace.c:3241 do_mount fs/namespace.c:3260 [inline] __do_sys_mount fs/namespace.c:3468 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3445 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3445 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888113d06a00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 39 bytes to the right of 64-byte region [ffff888113d06a00, ffff888113d06a40) The buggy address belongs to the page: page:ffffea00044f4180 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113d06 flags: 0x4000000000000200(slab) raw: 4000000000000200 dead000000000100 dead000000000122 ffff888100043800 raw: 0000000000000000 0000000000200020 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 103, ts 5266469798, free_ts 5265686430 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 alloc_slab_page mm/slub.c:-1 [inline] 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] __kmalloc+0x204/0x330 mm/slub.c:4029 __kmalloc_node include/linux/slab.h:418 [inline] kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x82/0x130 mm/util.c:612 kvmalloc include/linux/mm.h:822 [inline] simple_xattr_alloc+0x43/0xa0 fs/xattr.c:917 shmem_initxattrs+0x8d/0x200 mm/shmem.c:3211 security_inode_init_security+0x252/0x390 security/security.c:1033 shmem_mknod+0xb8/0x1c0 mm/shmem.c:2899 shmem_create+0x2b/0x40 mm/shmem.c:2954 lookup_open fs/namei.c:3247 [inline] open_last_lookups fs/namei.c:3317 [inline] path_openat+0x1377/0x3000 fs/namei.c:3506 do_filp_open+0x21c/0x460 fs/namei.c:3536 do_sys_openat2+0x13f/0x710 fs/open.c:1217 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 mm/page_alloc.c:3391 [inline] free_the_page+0x9e/0x370 mm/page_alloc.c:5407 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 free_pages+0x7c/0x90 mm/page_alloc.c:5429 selinux_genfs_get_sid+0x24d/0x2a0 security/selinux/hooks.c:1326 inode_doinit_with_dentry+0x86f/0x1050 security/selinux/hooks.c:1523 selinux_d_instantiate+0x27/0x40 security/selinux/hooks.c:6389 security_d_instantiate+0x9f/0x100 security/security.c:1980 d_splice_alias+0x6d/0x390 fs/dcache.c:3036 kernfs_iop_lookup+0x2a4/0x2f0 fs/kernfs/dir.c:1178 __lookup_slow+0x2b9/0x400 fs/namei.c:1640 lookup_slow+0x5a/0x80 fs/namei.c:1657 walk_component+0x48c/0x610 fs/namei.c:1952 lookup_last fs/namei.c:2403 [inline] path_lookupat+0x16d/0x450 fs/namei.c:2427 filename_lookup+0x26a/0x6f0 fs/namei.c:2460 user_path_at_empty+0x40/0x50 fs/namei.c:2740 Memory state around the buggy address: ffff888113d06900: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888113d06980: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888113d06a00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff888113d06a80: 00 00 00 00 00 00 00 02 fc fc fc fc fc fc fc fc ffff888113d06b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================