syzbot

EXT4-fs (loop0): mounted filesystem without journal. Quota mode: writeback.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1741
Read of size 18446744073709551572 at addr ffff888107829850 by task syz-executor178/290

CPU: 1 PID: 290 Comm: syz-executor178 Not tainted 6.1.141-syzkaller-00038-ge2deb0b42a3a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x71/0x210 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:427
 kasan_report+0x122/0x150 mm/kasan/report.c:531
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x280/0x290 mm/kasan/generic.c:189
 memmove+0x2d/0x70 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1741
 ext4_xattr_block_set+0xada/0x3270 fs/ext4/xattr.c:1988
 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline]
 ext4_expand_extra_isize_ea+0xf30/0x1990 fs/ext4/xattr.c:2792
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5967
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6088
 __ext4_unlink+0x673/0xb00 fs/ext4/namei.c:3341
 ext4_unlink+0x13a/0x3a0 fs/ext4/namei.c:3370
 vfs_unlink+0x39f/0x630 fs/namei.c:4321
 do_unlinkat+0x31f/0x6b0 fs/namei.c:4389
 __do_sys_unlink fs/namei.c:4437 [inline]
 __se_sys_unlink fs/namei.c:4435 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4435
 x64_sys_call+0x958/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fbcaeec0a79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 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:00007fff2e443718 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007fbcaeec0a79
RDX: 00007fbcaeec0a79 RSI: 00007fbcaeec0a79 RDI: 0000200000000180
RBP: 0032656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff2e4438f8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 290:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958
 kmemdup+0x2b/0x60 mm/util.c:134
 kmemdup include/linux/fortify-string.h:585 [inline]
 ext4_xattr_block_set+0x9dc/0x3270 fs/ext4/xattr.c:1936
 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline]
 ext4_expand_extra_isize_ea+0xf30/0x1990 fs/ext4/xattr.c:2792
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5967
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6088
 __ext4_unlink+0x673/0xb00 fs/ext4/namei.c:3341
 ext4_unlink+0x13a/0x3a0 fs/ext4/namei.c:3370
 vfs_unlink+0x39f/0x630 fs/namei.c:4321
 do_unlinkat+0x31f/0x6b0 fs/namei.c:4389
 __do_sys_unlink fs/namei.c:4437 [inline]
 __se_sys_unlink fs/namei.c:4435 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4435
 x64_sys_call+0x958/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888107829800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff888107829800, ffff888107829c00)

The buggy address belongs to the physical page:
page:ffffea00041e0a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107828
head:ffffea00041e0a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 4036728947, free_ts 3931453891
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2644
 get_page_from_freelist+0x2c7b/0x2cf0 mm/page_alloc.c:4539
 __alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5850
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x98/0x3d0 mm/slub.c:2015
 ___slab_alloc+0x6f6/0xb50 mm/slub.c:3203
 __slab_alloc+0x5e/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3462
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:449 [inline]
 __alloc_skb+0x236/0x4b0 net/core/skbuff.c:518
 alloc_skb include/linux/skbuff.h:1290 [inline]
 alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290
 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline]
 kobject_uevent_net_broadcast+0x1b4/0x5b0 lib/kobject_uevent.c:412
 kobject_uevent_env+0x54f/0x730 lib/kobject_uevent.c:608
 kobject_uevent+0x1d/0x30 lib/kobject_uevent.c:657
 rx_queue_add_kobject net/core/net-sysfs.c:1068 [inline]
 net_rx_queue_update_kobjects+0x249/0x4d0 net/core/net-sysfs.c:1108
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1545 [inline]
 __free_pages_ok+0xb02/0xc10 mm/page_alloc.c:1803
 free_the_page mm/page_alloc.c:832 [inline]
 __free_pages+0xec/0x100 mm/page_alloc.c:5939
 free_large_kmalloc+0xae/0xf0 mm/slab_common.c:915
 kfree+0x8b/0xf0 mm/slab_common.c:984
 kvfree+0x35/0x40 mm/util.c:639
 btf_add_type kernel/bpf/btf.c:1581 [inline]
 btf_check_all_metas+0x615/0xaa0 kernel/bpf/btf.c:4638
 btf_parse_vmlinux+0x437/0x940 kernel/bpf/btf.c:5227
 bpf_get_btf_vmlinux+0x41/0x60 kernel/bpf/verifier.c:15447
 btf_get_module_btf+0x85/0x200 kernel/bpf/btf.c:7266
 register_btf_kfunc_id_set+0x44/0x600 kernel/bpf/btf.c:7484
 register_nf_conntrack_bpf+0x1b/0xb0 net/netfilter/nf_conntrack_bpf.c:499
 nf_conntrack_init_start+0x3cc/0x460 net/netfilter/nf_conntrack_core.c:2762
 nf_conntrack_standalone_init+0x11/0x100 net/netfilter/nf_conntrack_standalone.c:1213
 do_one_initcall+0x198/0x530 init/main.c:1298
 do_initcall_level+0x16f/0x2d0 init/main.c:1371
 do_initcalls+0x50/0x92 init/main.c:1387

Memory state around the buggy address:
 ffff888107829700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888107829780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888107829800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^