loop4: rw=524288, sector=34359738360, nr_sectors = 8 limit=16 syz.4.153: attempt to access beyond end of device loop4: rw=524288, sector=8, nr_sectors = 16 limit=16 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_to_page include/linux/highmem.h:403 [inline] BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347 Read of size 4096 at addr ffff0000ca299000 by task syz.4.153/4987 CPU: 1 PID: 4987 Comm: syz.4.153 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Call trace: dump_backtrace+0x1c4/0x1f0 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+0x39c/0x494 fs/erofs/decompressor.c:347 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:435 z_erofs_decompress_pcluster fs/erofs/zdata.c:1161 [inline] z_erofs_decompress_queue+0x103c/0x1bf4 fs/erofs/zdata.c:1242 z_erofs_runqueue+0x1508/0x16a8 fs/erofs/zdata.c:1614 z_erofs_read_folio+0x2dc/0x5cc fs/erofs/zdata.c:1704 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+0x1290/0x20dc mm/filemap.c:2759 generic_file_read_iter+0xf8/0x5ac mm/filemap.c:2941 call_read_iter include/linux/fs.h:2265 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x3cc/0x7b8 fs/read_write.c:470 ksys_read+0x12c/0x228 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+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x200/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c 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:589 Allocated by task 4685: 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+0xcc/0x174 mm/slab_common.c:956 kstrdup mm/util.c:61 [inline] kstrdup_const+0x90/0xdc mm/util.c:84 __kernfs_new_node+0xb0/0x5fc fs/kernfs/dir.c:610 kernfs_new_node+0x120/0x230 fs/kernfs/dir.c:690 __kernfs_create_file+0x60/0x2e0 fs/kernfs/file.c:1068 sysfs_add_file_mode_ns+0x1e8/0x2a4 fs/sysfs/file.c:298 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x3e8/0xb24 fs/sysfs/group.c:148 internal_create_groups fs/sysfs/group.c:188 [inline] sysfs_create_groups+0x60/0x134 fs/sysfs/group.c:214 setup_port drivers/infiniband/core/sysfs.c:1255 [inline] ib_setup_port_attrs+0xb38/0x1a14 drivers/infiniband/core/sysfs.c:1441 add_one_compat_dev+0x338/0x4e8 drivers/infiniband/core/device.c:979 rdma_dev_init_net+0x1f0/0x270 drivers/infiniband/core/device.c:1195 ops_init+0x2b0/0x53c net/core/net_namespace.c:138 setup_net+0x494/0xb6c net/core/net_namespace.c:336 copy_net_ns+0x2b8/0x578 net/core/net_namespace.c:508 create_new_namespaces+0x30c/0x604 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x108/0x160 kernel/nsproxy.c:226 ksys_unshare+0x3f0/0x70c kernel/fork.c:3289 __do_sys_unshare kernel/fork.c:3363 [inline] __se_sys_unshare kernel/fork.c:3361 [inline] __arm64_sys_unshare+0x3c/0x50 kernel/fork.c:3361 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x12c 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:589 The buggy address belongs to the object at ffff0000ca299000 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000ca299000, ffff0000ca299080) The buggy address belongs to the physical page: page:000000006ff9c482 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10a299 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 dead000000000100 dead000000000122 ffff0000c0002300 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000ca298f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000ca298f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000ca299000: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000ca299080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000ca299100: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== syz.4.153: attempt to access beyond end of device loop4: rw=0, sector=34359738360, nr_sectors = 8 limit=16