loop3: detected capacity change from 0 to 1024 EXT4-fs (loop3): mounted filesystem without journal. Quota mode: none. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x965/0x1e90 fs/ext4/xattr.c:1741 Read of size 18446744073709551588 at addr ffff88807d1dd840 by task syz.3.250/5275 CPU: 0 PID: 5275 Comm: syz.3.250 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x965/0x1e90 fs/ext4/xattr.c:1741 ext4_xattr_block_set+0xadf/0x32a0 fs/ext4/xattr.c:1988 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2515 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 path_setxattr+0x142/0x280 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648 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: 0033:0x7fd24f78eec9 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:00007fd250674038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fd24f9e5fa0 RCX: 00007fd24f78eec9 RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100 RBP: 00007fd24f811f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd24f9e6038 R14: 00007fd24f9e5fa0 R15: 00007fffe631fc88 Allocated by task 5275: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956 kmemdup+0x27/0x60 mm/util.c:129 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x9e1/0x32a0 fs/ext4/xattr.c:1936 ext4_xattr_set_handle+0xbd5/0x12b0 fs/ext4/xattr.c:2413 ext4_xattr_set+0x22a/0x320 fs/ext4/xattr.c:2515 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x168/0x2f0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x2b2/0x2d0 fs/xattr.c:617 path_setxattr+0x142/0x280 fs/xattr.c:636 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __x64_sys_setxattr+0xb7/0xd0 fs/xattr.c:648 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 ffff88807d1dd800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff88807d1dd800, ffff88807d1ddc00) The buggy address belongs to the physical page: page:ffffea0001f47600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d1d8 head:ffffea0001f47600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888017441dc0 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4256, tgid 4256 (syz-executor), ts 73362602921, free_ts 72772718015 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1230 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515 alloc_skb include/linux/skbuff.h:1271 [inline] __tcp_send_ack+0x9d/0x5a0 net/ipv4/tcp_output.c:4022 tcp_cleanup_rbuf net/ipv4/tcp.c:1651 [inline] tcp_recvmsg_locked+0x1ae9/0x22f0 net/ipv4/tcp.c:2690 tcp_recvmsg+0x212/0x810 net/ipv4/tcp.c:2720 inet_recvmsg+0x12c/0x1e0 net/ipv4/af_inet.c:890 sock_recvmsg_nosec net/socket.c:1022 [inline] sock_recvmsg net/socket.c:1040 [inline] sock_read_iter+0x2bf/0x370 net/socket.c:1121 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x434/0x920 fs/read_write.c:470 ksys_read+0x143/0x240 fs/read_write.c:613 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 __skb_frag_unref include/linux/skbuff.h:3459 [inline] skb_release_data+0x499/0x7c0 net/core/skbuff.c:785 skb_release_all net/core/skbuff.c:856 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:870 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3412 [inline] tcp_ack+0x1f57/0x65b0 net/ipv4/tcp_input.c:3971 tcp_rcv_established+0xee3/0x1d30 net/ipv4/tcp_input.c:6022 tcp_v4_do_rcv+0x48d/0xb00 net/ipv4/tcp_ipv4.c:1683 sk_backlog_rcv include/net/sock.h:1125 [inline] __release_sock+0x1b9/0x420 net/core/sock.c:2944 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2964 sk_flush_backlog include/net/sock.h:1223 [inline] tcp_sendmsg_locked+0x3021/0x3f10 net/ipv4/tcp.c:1328 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1490 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] sock_write_iter+0x2b5/0x3a0 net/socket.c:1143 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x44c/0x960 fs/read_write.c:584 ksys_write+0x143/0x240 fs/read_write.c:637 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 Memory state around the buggy address: ffff88807d1dd700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d1dd780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d1dd800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88807d1dd880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807d1dd900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================