EXT4-fs error (device loop0): ext4_xattr_inode_iget:404: comm syz-executor110: inode #1: comm syz-executor110: iget: illegal inode # EXT4-fs error (device loop0): ext4_xattr_inode_iget:409: comm syz-executor110: error while reading EA inode 1 err=-117 EXT4-fs (loop0): 1 orphan inode deleted EXT4-fs (loop0): mounted filesystem without journal. Opts: journal_ioprio=0x0000000000000005,nogrpid,orlov,minixdf,resgid=0x0000000000000000,stripe=0x0000000000000006,usrjquota=,,errors=continue ================================================================== BUG: KASAN: use-after-free in ext4_insert_dentry+0x392/0x710 fs/ext4/namei.c:2119 Write of size 251 at addr ffff88811c971f14 by task syz-executor110/284 CPU: 1 PID: 284 Comm: syz-executor110 Not tainted 5.10.234-syzkaller-00023-g3f5f2283d684 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 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 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 memcpy+0x44/0x70 mm/kasan/shadow.c:66 ext4_insert_dentry+0x392/0x710 fs/ext4/namei.c:2119 add_dirent_to_buf+0x3ac/0x780 fs/ext4/namei.c:2163 make_indexed_dir+0xe9f/0x1500 fs/ext4/namei.c:2354 ext4_add_entry+0xdcf/0x1280 fs/ext4/namei.c:2460 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2786 ext4_symlink+0x911/0xe40 fs/ext4/namei.c:3610 vfs_symlink+0x367/0x4f0 fs/namei.c:4099 do_symlinkat+0x19b/0x400 fs/namei.c:4126 __do_sys_symlink fs/namei.c:4145 [inline] __se_sys_symlink fs/namei.c:4143 [inline] __x64_sys_symlink+0x60/0x70 fs/namei.c:4143 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f52c5e7cc69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 1f 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeaa0734e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f52c5e7cc69 RDX: 0000000000000000 RSI: 0000400000000cc0 RDI: 0000400000000dc0 RBP: 00007f52c5ec162e R08: 00007f52c5ec165e R09: 00007f52c5ec165e R10: 00007f52c5ec165e R11: 0000000000000246 R12: 00007f52c5ec15af R13: 00007ffeaa073550 R14: 00007f52c5ec147a R15: 00007ffeaa073528 The buggy address belongs to the page: page:ffffea0004725c40 refcount:3 mapcount:0 mapping:ffff8881091a0b10 index:0x3f pfn:0x11c971 aops:def_blk_aops ino:0 flags: 0x400000000000201a(referenced|dirty|lru|private) raw: 400000000000201a ffffea00044b46c8 ffff888100194020 ffff8881091a0b10 raw: 000000000000003f ffff88811bf36930 00000003ffffffff ffff88810013e000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88810013e000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 284, ts 21526652651, free_ts 15325588372 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_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x669/0x950 mm/filemap.c:1848 find_or_create_page include/linux/pagemap.h:402 [inline] grow_dev_page fs/buffer.c:976 [inline] grow_buffers fs/buffer.c:1045 [inline] __getblk_slow fs/buffer.c:1072 [inline] __getblk_gfp+0x221/0x7e0 fs/buffer.c:1370 sb_getblk include/linux/buffer_head.h:361 [inline] ext4_getblk+0x259/0x660 fs/ext4/inode.c:877 ext4_bread+0x2f/0x1b0 fs/ext4/inode.c:922 ext4_append+0x29a/0x4d0 fs/ext4/namei.c:83 make_indexed_dir+0x505/0x1500 fs/ext4/namei.c:2280 ext4_add_entry+0xdcf/0x1280 fs/ext4/namei.c:2460 ext4_add_nondir+0x97/0x270 fs/ext4/namei.c:2786 ext4_symlink+0x911/0xe40 fs/ext4/namei.c:3610 vfs_symlink+0x367/0x4f0 fs/namei.c:4099 do_symlinkat+0x19b/0x400 fs/namei.c:4126 __do_sys_symlink fs/namei.c:4145 [inline] __se_sys_symlink fs/namei.c:4143 [inline] __x64_sys_symlink+0x60/0x70 fs/namei.c:4143 do_syscall_64+0x34/0x70 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+0x306/0x560 mm/mmap.c:3375 __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: ffff88811c971f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811c971f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811c972000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88811c972080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88811c972100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================