EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1790
Read of size 18446744073709551588 at addr ffff88807de6d040 by task syz.2.1662/13973

CPU: 0 PID: 13973 Comm: syz.2.1662 Not tainted 6.6.99-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x200 mm/kasan/report.c:466
 kasan_report+0x117/0x150 mm/kasan/report.c:579
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x288/0x290 mm/kasan/generic.c:187
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x94b/0x1e90 fs/ext4/xattr.c:1790
 ext4_xattr_block_set+0xae3/0x32a0 fs/ext4/xattr.c:2037
 ext4_xattr_set_handle+0xbff/0x1290 fs/ext4/xattr.c:2462
 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2564
 __vfs_setxattr+0x431/0x470 fs/xattr.c:201
 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235
 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322
 do_setxattr fs/xattr.c:630 [inline]
 path_setxattr+0x362/0x550 fs/xattr.c:659
 __do_sys_setxattr fs/xattr.c:677 [inline]
 __se_sys_setxattr fs/xattr.c:673 [inline]
 __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f62a978e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f62aa679038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f62a99b5fa0 RCX: 00007f62a978e9a9
RDX: 0000200000000140 RSI: 00002000000001c0 RDI: 0000200000000000
RBP: 00007f62a9810d69 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000841 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f62a99b5fa0 R15: 00007fff7ddc8668
 </TASK>

Allocated by task 13973:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027
 kmemdup+0x2b/0x70 mm/util.c:131
 kmemdup include/linux/fortify-string.h:779 [inline]
 ext4_xattr_block_set+0x9e5/0x32a0 fs/ext4/xattr.c:1985
 ext4_xattr_set_handle+0xbff/0x1290 fs/ext4/xattr.c:2462
 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2564
 __vfs_setxattr+0x431/0x470 fs/xattr.c:201
 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235
 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322
 do_setxattr fs/xattr.c:630 [inline]
 path_setxattr+0x362/0x550 fs/xattr.c:659
 __do_sys_setxattr fs/xattr.c:677 [inline]
 __se_sys_setxattr fs/xattr.c:673 [inline]
 __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88807de6d000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
 1024-byte region [ffff88807de6d000, ffff88807de6d400)

The buggy address belongs to the physical page:
page:ffffea0001f79a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7de68
head:ffffea0001f79a00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017841dc0 ffffea0001f6ce00 dead000000000002
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 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 12, tgid 12 (kworker/u4:1), ts 177594720698, free_ts 177563074689
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 alloc_slab_page+0x5d/0x170 mm/slub.c:1876
 allocate_slab mm/slub.c:2023 [inline]
 new_slab+0x87/0x2e0 mm/slub.c:2076
 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
 __slab_alloc mm/slub.c:3329 [inline]
 __slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc_node mm/slub.c:3475 [inline]
 __kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc_node_track_caller+0xa2/0x230 mm/slab_common.c:1027
 kmalloc_reserve+0x117/0x260 net/core/skbuff.c:581
 pskb_expand_head+0x185/0x1230 net/core/skbuff.c:2099
 __skb_cow include/linux/skbuff.h:3620 [inline]
 skb_cow_head include/linux/skbuff.h:3654 [inline]
 batadv_skb_head_push+0x166/0x200 net/batman-adv/soft-interface.c:72
 batadv_send_skb_packet+0xeb/0x650 net/batman-adv/send.c:86
 batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:391 [inline]
 batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:419 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x69a/0x840 net/batman-adv/bat_iv_ogm.c:1699
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
 napi_frag_unref include/linux/skbuff.h:3484 [inline]
 skb_release_data+0x49a/0x800 net/core/skbuff.c:981
 skb_release_all net/core/skbuff.c:1053 [inline]
 __kfree_skb net/core/skbuff.c:1067 [inline]
 skb_attempt_defer_free+0x12f/0x530 net/core/skbuff.c:6840
 tcp_eat_recv_skb net/ipv4/tcp.c:1515 [inline]
 tcp_recvmsg_locked+0x1194/0x2300 net/ipv4/tcp.c:2555
 tcp_recvmsg+0x216/0x810 net/ipv4/tcp.c:2601
 inet_recvmsg+0x130/0x1e0 net/ipv4/af_inet.c:882
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg net/socket.c:1068 [inline]
 sock_read_iter+0x2b7/0x3b0 net/socket.c:1138
 call_read_iter include/linux/fs.h:2012 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x431/0x920 fs/read_write.c:470
 ksys_read+0x147/0x250 fs/read_write.c:613
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88807de6cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807de6cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807de6d000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff88807de6d080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807de6d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================