================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1773 Read of size 18446744073709551572 at addr ffff888026f5e050 by task syz-executor900/7056 CPU: 0 UID: 0 PID: 7056 Comm: syz-executor900 Not tainted 6.15.0-next-20250605-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xd2/0x2b0 mm/kasan/report.c:521 kasan_report+0x118/0x150 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1773 ext4_xattr_block_set+0x872/0x2ac0 fs/ext4/xattr.c:2020 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6306 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6349 [inline] __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6427 __ext4_unlink+0x631/0xab0 fs/ext4/namei.c:3280 ext4_unlink+0x216/0x5d0 fs/ext4/namei.c:3310 vfs_unlink+0x391/0x650 fs/namei.c:4586 do_unlinkat+0x350/0x560 fs/namei.c:4650 __do_sys_unlink fs/namei.c:4696 [inline] __se_sys_unlink fs/namei.c:4694 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:4694 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe5fbf13f89 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 18 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe5fbea7218 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 00007fe5fbf9c6b8 RCX: 00007fe5fbf13f89 RDX: 00007fe5fbf13f89 RSI: 00000000000f4240 RDI: 0000200000000180 RBP: 00007fe5fbf9c6b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffb0 R13: 0031656c69662f2e R14: 0000200000000180 R15: 0000200000000140 Allocated by task 7056: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kmalloc_node_track_caller_noprof+0x271/0x4e0 mm/slub.c:4347 kmemdup_noprof+0x2b/0x70 mm/util.c:137 _Z14kmemdup_noprofPKvU25pass_dynamic_object_size0mj include/linux/fortify-string.h:765 [inline] ext4_xattr_block_set+0x781/0x2ac0 fs/ext4/xattr.c:1968 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0x12d5/0x1ea0 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6306 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6349 [inline] __ext4_mark_inode_dirty+0x46c/0x700 fs/ext4/inode.c:6427 __ext4_unlink+0x631/0xab0 fs/ext4/namei.c:3280 ext4_unlink+0x216/0x5d0 fs/ext4/namei.c:3310 vfs_unlink+0x391/0x650 fs/namei.c:4586 do_unlinkat+0x350/0x560 fs/namei.c:4650 __do_sys_unlink fs/namei.c:4696 [inline] __se_sys_unlink fs/namei.c:4694 [inline] __x64_sys_unlink+0x47/0x50 fs/namei.c:4694 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888026f5e000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 80 bytes inside of 1024-byte region [ffff888026f5e000, ffff888026f5e400) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26f58 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a441dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a441dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00009bd601 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 59, tgid 59 (kworker/u8:4), ts 9330196244, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959 alloc_slab_page mm/slub.c:2453 [inline] allocate_slab+0x65/0x3b0 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859 __slab_alloc mm/slub.c:3949 [inline] __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kmalloc_node_noprof+0x2fd/0x4e0 mm/slub.c:4334 kmalloc_node_noprof include/linux/slab.h:932 [inline] blk_alloc_flush_queue+0xe2/0x230 block/blk-flush.c:490 blk_mq_alloc_hctx block/blk-mq.c:4037 [inline] blk_mq_alloc_and_init_hctx+0x679/0xd60 block/blk-mq.c:4500 __blk_mq_realloc_hw_ctxs+0x169/0x400 block/blk-mq.c:4531 blk_mq_realloc_hw_ctxs block/blk-mq.c:4558 [inline] blk_mq_init_allocated_queue+0x400/0x1490 block/blk-mq.c:4590 blk_mq_alloc_queue+0x197/0x290 block/blk-mq.c:4400 scsi_alloc_sdev+0x76d/0xb50 drivers/scsi/scsi_scan.c:339 scsi_probe_and_add_lun+0x1cb/0x4520 drivers/scsi/scsi_scan.c:1210 __scsi_scan_target+0x1dd/0xd10 drivers/scsi/scsi_scan.c:1775 scsi_scan_channel drivers/scsi/scsi_scan.c:1863 [inline] scsi_scan_host_selected+0x372/0x690 drivers/scsi/scsi_scan.c:1892 do_scsi_scan_host drivers/scsi/scsi_scan.c:2031 [inline] do_scan_async+0x124/0x760 drivers/scsi/scsi_scan.c:2041 page_owner free stack trace missing Memory state around the buggy address: ffff888026f5df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888026f5df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888026f5e000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888026f5e080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888026f5e100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================