================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2905 Read of size 4 at addr ffff888126bc4000 by task syz-executor/364 CPU: 1 PID: 364 Comm: syz-executor Not tainted 6.1.93-syzkaller-00068-gb5e374dda921 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2905 ext4_evict_inode+0xef9/0x1550 fs/ext4/inode.c:296 evict+0x2a3/0x630 fs/inode.c:666 iput_final fs/inode.c:1791 [inline] iput+0x616/0x690 fs/inode.c:1817 d_delete_notify include/linux/fsnotify.h:286 [inline] vfs_rmdir+0x3c2/0x500 fs/namei.c:4205 do_rmdir+0x3ab/0x630 fs/namei.c:4253 __do_sys_unlinkat fs/namei.c:4433 [inline] __se_sys_unlinkat fs/namei.c:4427 [inline] __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4427 x64_sys_call+0x6e9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7435b79497 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff4497b8d8 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f7435b79497 RDX: 0000000000000200 RSI: 00007fff4497ca80 RDI: 00000000ffffff9c RBP: 00007f7435be77dc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007fff4497ca80 R13: 00007f7435be77dc R14: 0000000000006854 R15: 00007fff4497ec30 The buggy address belongs to the physical page: page:ffffea00049af100 refcount:2 mapcount:0 mapping:ffff88810bd23a50 index:0x1 pfn:0x126bc4 memcg:ffff88810d368000 aops:def_blk_aops ino:700004 flags: 0x560000000002205e(referenced|uptodate|dirty|lru|workingset|private|mappedtodisk|zone=1) raw: 560000000002205e ffffea00049d7c08 ffffea0004b4b108 ffff88810bd23a50 raw: 0000000000000001 ffff88810bea5a80 00000002ffffffff ffff88810d368000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 400, tgid 400 (syz.4.19), ts 26868950617, free_ts 26847906792 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5714 __folio_alloc+0x15/0x40 mm/page_alloc.c:5746 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] filemap_alloc_folio include/linux/pagemap.h:513 [inline] __filemap_get_folio+0x827/0xae0 mm/filemap.c:1989 pagecache_get_page+0x2f/0x110 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:654 [inline] grow_dev_page fs/buffer.c:989 [inline] grow_buffers fs/buffer.c:1054 [inline] __getblk_slow fs/buffer.c:1081 [inline] __getblk_gfp+0x205/0x7d0 fs/buffer.c:1376 sb_getblk include/linux/buffer_head.h:356 [inline] __ext4_get_inode_loc+0x4ed/0xe40 fs/ext4/inode.c:4502 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4615 [inline] __ext4_iget+0x4ff/0x3ee0 fs/ext4/inode.c:4837 __ext4_fill_super fs/ext4/super.c:5386 [inline] ext4_fill_super+0x669c/0x8460 fs/ext4/super.c:5651 get_tree_bdev+0x440/0x680 fs/super.c:1357 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5681 vfs_get_tree+0x88/0x290 fs/super.c:1564 do_new_mount+0x2ba/0xb30 fs/namespace.c:3051 path_mount+0x671/0x1070 fs/namespace.c:3381 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3646 release_pages+0xf7f/0xfe0 mm/swap.c:1063 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:315 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu mm/mmu_gather.c:261 [inline] tlb_finish_mmu+0x1e0/0x3f0 mm/mmu_gather.c:361 exit_mmap+0x421/0x940 mm/mmap.c:3346 __mmput+0x95/0x310 kernel/fork.c:1298 mmput+0x56/0x170 kernel/fork.c:1321 exit_mm kernel/exit.c:566 [inline] do_exit+0xb29/0x2b80 kernel/exit.c:862 do_group_exit+0x21a/0x2d0 kernel/exit.c:1025 __do_sys_exit_group kernel/exit.c:1036 [inline] __se_sys_exit_group kernel/exit.c:1034 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1034 x64_sys_call+0x610/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff888126bc3f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888126bc3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888126bc4000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888126bc4080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888126bc4100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem. EXT4-fs (loop1): unmounting filesystem.