================================================================== BUG: KASAN: slab-out-of-bounds in should_fault_in_pages fs/gfs2/file.c:785 [inline] BUG: KASAN: slab-out-of-bounds in gfs2_file_buffered_write+0x576/0x900 fs/gfs2/file.c:1070 Read of size 8 at addr ffff888060d2f900 by task syz.4.21/4402 CPU: 0 PID: 4402 Comm: syz.4.21 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 should_fault_in_pages fs/gfs2/file.c:785 [inline] gfs2_file_buffered_write+0x576/0x900 fs/gfs2/file.c:1070 gfs2_file_write_iter+0xf3b/0x11d0 fs/gfs2/file.c:1145 do_iter_readv_writev+0x497/0x600 fs/read_write.c:-1 do_iter_write+0x205/0x7b0 fs/read_write.c:855 iter_file_splice_write+0x65f/0xc40 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:936 splice_direct_to_actor+0x4dc/0xb50 fs/splice.c:891 do_splice_direct+0x1b9/0x2c0 fs/splice.c:979 generic_copy_file_range fs/read_write.c:1385 [inline] vfs_copy_file_range+0x9bf/0x1470 fs/read_write.c:1531 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range+0x31d/0x480 fs/read_write.c:1551 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fae328afbe9 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:00007fae30b17038 EFLAGS: 00000246 ORIG_RAX: 0000000000000146 RAX: ffffffffffffffda RBX: 00007fae32ae6fa0 RCX: 00007fae328afbe9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007fae32932e19 R08: fffffbffa003e458 R09: 0700000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fae32ae7038 R14: 00007fae32ae6fa0 R15: 00007fff57d2e878 Allocated by task 4402: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522 kmalloc_array include/linux/slab.h:644 [inline] kcalloc include/linux/slab.h:673 [inline] iter_file_splice_write+0x17f/0xc40 fs/splice.c:628 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:936 splice_direct_to_actor+0x4dc/0xb50 fs/splice.c:891 do_splice_direct+0x1b9/0x2c0 fs/splice.c:979 generic_copy_file_range fs/read_write.c:1385 [inline] vfs_copy_file_range+0x9bf/0x1470 fs/read_write.c:1531 __do_sys_copy_file_range fs/read_write.c:1588 [inline] __se_sys_copy_file_range+0x31d/0x480 fs/read_write.c:1551 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x35/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3011 [inline] call_rcu+0x182/0x930 kernel/rcu/tree.c:3091 fib_create_info+0x196e/0x24f0 net/ipv4/fib_semantics.c:1608 fib_table_insert+0xe4/0x1b20 net/ipv4/fib_trie.c:1212 fib_magic+0x2c1/0x390 net/ipv4/fib_frontend.c:1106 fib_add_ifaddr+0x140/0x5e0 net/ipv4/fib_frontend.c:1128 fib_netdev_event+0x35c/0x480 net/ipv4/fib_frontend.c:1488 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391 call_netdevice_notifiers_extack net/core/dev.c:2061 [inline] call_netdevice_notifiers net/core/dev.c:2075 [inline] __dev_notify_flags+0x178/0x2d0 net/core/dev.c:-1 dev_change_flags+0xe3/0x1a0 net/core/dev.c:8929 do_setlink+0xc01/0x3980 net/core/rtnetlink.c:2779 __rtnl_newlink net/core/rtnetlink.c:3450 [inline] rtnl_newlink+0x1419/0x17d0 net/core/rtnetlink.c:3572 rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] __sys_sendto+0x423/0x580 net/socket.c:2063 __do_sys_sendto net/socket.c:2075 [inline] __se_sys_sendto net/socket.c:2071 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2071 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888060d2f800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes to the right of 256-byte region [ffff888060d2f800, ffff888060d2f900) The buggy address belongs to the page: page:ffffea0001834b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x60d2e head:ffffea0001834b80 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e69480 0000000600000006 ffff888016841b40 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4192, ts 72368683025, free_ts 21337943317 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc+0x1cd/0x330 mm/slub.c:4403 kmalloc include/linux/slab.h:609 [inline] kzalloc include/linux/slab.h:735 [inline] fib_create_info+0xabc/0x24f0 net/ipv4/fib_semantics.c:1478 fib_table_insert+0xe4/0x1b20 net/ipv4/fib_trie.c:1212 fib_magic+0x2c1/0x390 net/ipv4/fib_frontend.c:1106 fib_add_ifaddr+0x140/0x5e0 net/ipv4/fib_frontend.c:1128 fib_inetaddr_event+0x13c/0x1c0 net/ipv4/fib_frontend.c:1442 notifier_call_chain kernel/notifier.c:83 [inline] blocking_notifier_call_chain+0x103/0x1b0 kernel/notifier.c:318 __inet_insert_ifa+0x9e9/0xbc0 net/ipv4/devinet.c:568 inet_rtm_newaddr+0x940/0x1800 net/ipv4/devinet.c:967 rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 free_contig_range+0x96/0xf0 mm/page_alloc.c:9406 destroy_args+0x100/0xa20 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1336 do_one_initcall+0x1ee/0x680 init/main.c:1302 do_initcall_level+0x137/0x1f0 init/main.c:1375 do_initcalls+0x4b/0x90 init/main.c:1391 kernel_init_freeable+0x3ce/0x560 init/main.c:1615 kernel_init+0x19/0x1b0 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888060d2f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888060d2f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888060d2f900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888060d2f980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060d2fa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================