loop1: rw=524288, sector=1056, nr_sectors = 16 limit=16 syz.1.760: attempt to access beyond end of device loop1: rw=524288, sector=8, nr_sectors = 16 limit=16 ================================================================== BUG: KASAN: use-after-free in memcpy_to_page include/linux/highmem.h:403 [inline] BUG: KASAN: use-after-free in z_erofs_transform_plain+0x3a4/0x490 fs/erofs/decompressor.c:346 Read of size 4096 at addr ffff0000f533e000 by task syz.1.760/6857 CPU: 0 PID: 6857 Comm: syz.1.760 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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 memcpy+0x48/0x90 mm/kasan/shadow.c:65 memcpy_to_page include/linux/highmem.h:403 [inline] z_erofs_transform_plain+0x3a4/0x490 fs/erofs/decompressor.c:346 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:434 z_erofs_decompress_pcluster fs/erofs/zdata.c:1159 [inline] z_erofs_decompress_queue+0x100c/0x1b40 fs/erofs/zdata.c:1240 z_erofs_runqueue+0x152c/0x16cc fs/erofs/zdata.c:1603 z_erofs_read_folio+0x2d8/0x5c8 fs/erofs/zdata.c:1693 filemap_read_folio+0x134/0x384 mm/filemap.c:2490 filemap_update_page mm/filemap.c:2575 [inline] filemap_get_pages mm/filemap.c:2689 [inline] filemap_read+0x12cc/0x2104 mm/filemap.c:2759 generic_file_read_iter+0xf8/0x5c4 mm/filemap.c:2941 call_read_iter include/linux/fs.h:2259 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x3d4/0x7f0 fs/read_write.c:470 ksys_read+0x12c/0x224 fs/read_write.c:613 __do_sys_read fs/read_write.c:623 [inline] __se_sys_read fs/read_write.c:621 [inline] __arm64_sys_read+0x7c/0x90 fs/read_write.c:621 __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 6572: 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] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] apparmor_sk_alloc_security+0x84/0x108 security/apparmor/lsm.c:812 security_sk_alloc+0x80/0xbc security/security.c:2332 sk_prot_alloc+0xe0/0x1ec net/core/sock.c:2055 sk_alloc+0x44/0x390 net/core/sock.c:2108 unix_create1+0xd4/0x738 net/unix/af_unix.c:-1 unix_create+0x148/0x1f4 net/unix/af_unix.c:1017 __sock_create+0x4b0/0x8b4 net/socket.c:1549 sock_create net/socket.c:1605 [inline] __sys_socketpair+0x35c/0x6c0 net/socket.c:1736 __do_sys_socketpair net/socket.c:1785 [inline] __se_sys_socketpair net/socket.c:1782 [inline] __arm64_sys_socketpair+0x9c/0xb8 net/socket.c:1782 __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 tnode_free net/ipv4/fib_trie.c:496 [inline] replace+0x20c/0x52c net/ipv4/fib_trie.c:522 inflate net/ipv4/fib_trie.c:624 [inline] resize+0xe04/0x233c net/ipv4/fib_trie.c:869 trie_rebalance net/ipv4/fib_trie.c:1106 [inline] fib_insert_node net/ipv4/fib_trie.c:1150 [inline] fib_insert_alias+0xb84/0xee8 net/ipv4/fib_trie.c:1164 fib_trie_unmerge+0x270/0xafc net/ipv4/fib_trie.c:1916 fib_unmerge+0xdc/0x2f4 net/ipv4/fib_frontend.c:161 fib4_rule_configure+0xe0/0x998 net/ipv4/fib_rules.c:242 fib_nl_newrule+0xf4c/0x172c net/core/fib_rules.c:814 rtnetlink_rcv_msg+0x698/0xcdc net/core/rtnetlink.c:6157 netlink_rcv_skb+0x218/0x3e8 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6175 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x60c/0x814 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6f4/0x9c0 net/netlink/af_netlink.c:1872 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 ffff0000f533e000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000f533e000, ffff0000f533e080) The buggy address belongs to the physical page: page:00000000ab1059b8 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000f533e000 pfn:0x13533e flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 fffffc0003d7a3c8 fffffc00030e6e88 ffff0000c0002300 raw: ffff0000f533e000 000000000010000d 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f533df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000f533df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000f533e000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f533e080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000f533e100: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ================================================================== syz.1.760: attempt to access beyond end of device loop1: rw=0, sector=1056, nr_sectors = 8 limit=16