================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xfbc/0x15a0 fs/ext4/xattr.c:1686 Read of size 18446744073709550592 at addr ffff0000d4469400 by task syz.2.262/5437 CPU: 0 PID: 5437 Comm: syz.2.262 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memmove+0x48/0x90 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0xfbc/0x15a0 fs/ext4/xattr.c:1686 ext4_xattr_block_set+0x640/0x2880 fs/ext4/xattr.c:1976 ext4_xattr_set_handle+0xc68/0x1344 fs/ext4/xattr.c:2398 ext4_xattr_set+0x1f4/0x2c0 fs/ext4/xattr.c:2500 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x384/0x3a0 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x258/0x2d8 fs/xattr.c:617 path_setxattr+0x130/0x260 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 5437: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956 kmemdup+0x5c/0x98 mm/util.c:129 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x574/0x2880 fs/ext4/xattr.c:1924 ext4_xattr_set_handle+0xc68/0x1344 fs/ext4/xattr.c:2398 ext4_xattr_set+0x1f4/0x2c0 fs/ext4/xattr.c:2500 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x384/0x3a0 fs/xattr.c:182 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277 vfs_setxattr+0x158/0x2ac fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x258/0x2d8 fs/xattr.c:617 path_setxattr+0x130/0x260 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:46 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 call_rcu+0x100/0x94c kernel/rcu/tree.c:2849 sctp_transport_destroy net/sctp/transport.c:173 [inline] sctp_transport_put+0xf0/0x170 net/sctp/transport.c:486 sctp_transport_free+0x140/0x158 net/sctp/transport.c:144 sctp_association_free+0x5c0/0x6e0 net/sctp/associola.c:382 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:944 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1331 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1199 [inline] sctp_do_sm+0x2cb8/0x481c net/sctp/sm_sideeffect.c:1170 sctp_assoc_bh_rcv+0x37c/0x69c net/sctp/associola.c:1054 sctp_inq_push+0x190/0x1b4 net/sctp/inqueue.c:88 sctp_backlog_rcv+0x134/0x33c net/sctp/input.c:346 sk_backlog_rcv include/net/sock.h:1138 [inline] __release_sock+0x1b4/0x3b4 net/core/sock.c:2945 release_sock+0x60/0x1bc net/core/sock.c:3511 sctp_sendmsg+0x13f8/0x20b4 net/sctp/socket.c:2033 inet_sendmsg+0x154/0x284 net/ipv4/af_inet.c:841 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5c8/0x938 net/socket.c:2518 ___sys_sendmsg net/socket.c:2572 [inline] __sys_sendmsg+0x288/0x374 net/socket.c:2601 __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg net/socket.c:2608 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2608 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000d4469000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of 1024-byte region [ffff0000d4469000, ffff0000d4469400) The buggy address belongs to the physical page: page:00000000dc25afdf refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x114468 head:00000000dc25afdf order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c0002780 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d4469300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000d4469380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000d4469400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d4469480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d4469500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: comm syz.2.262: inode #808464432: comm syz.2.262: iget: illegal inode # EXT4-fs error (device loop2): ext4_xattr_inode_iget:406: comm syz.2.262: error while reading EA inode 808464432 err=-117