================================================================== BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:186 [inline] BUG: KASAN: slab-out-of-bounds in atomic_read arch/x86/include/asm/atomic.h:27 [inline] BUG: KASAN: slab-out-of-bounds in refcount_inc_not_zero+0xd3/0xe0 lib/refcount.c:120 Read of size 4 at addr ffff888061128080 by task syz-executor.1/11814 CPU: 1 PID: 11814 Comm: syz-executor.1 Not tainted 4.14.129 #23 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x19c lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429 __read_once_size include/linux/compiler.h:186 [inline] atomic_read arch/x86/include/asm/atomic.h:27 [inline] refcount_inc_not_zero+0xd3/0xe0 lib/refcount.c:120 refcount_inc+0x16/0x40 lib/refcount.c:153 sock_hold include/net/sock.h:619 [inline] l2tp_session_add_to_tunnel net/l2tp/l2tp_core.c:368 [inline] l2tp_session_create+0x118b/0x1600 net/l2tp/l2tp_core.c:1846 pppol2tp_connect+0x11bf/0x18b0 net/l2tp/l2tp_ppp.c:721 SYSC_connect+0x1f6/0x2d0 net/socket.c:1655 SyS_connect+0x24/0x30 net/socket.c:1636 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459519 RSP: 002b:00007f208a75dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459519 RDX: 000000000000002e RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f208a75e6d4 R13: 00000000004bfa22 R14: 00000000004d14a8 R15: 00000000ffffffff Allocated by task 6831: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 kasan_slab_alloc+0xf/0x20 mm/kasan/kasan.c:489 kmem_cache_alloc+0x12e/0x780 mm/slab.c:3552 mempool_alloc_slab+0x47/0x60 mm/mempool.c:450 mempool_alloc+0x138/0x300 mm/mempool.c:330 bvec_alloc+0xd1/0x2e0 block/bio.c:216 bio_alloc_bioset+0x419/0x680 block/bio.c:506 bio_alloc include/linux/bio.h:417 [inline] io_submit_init_bio fs/ext4/page-io.c:374 [inline] io_submit_add_bh fs/ext4/page-io.c:399 [inline] ext4_bio_write_page+0x77c/0xe63 fs/ext4/page-io.c:506 mpage_submit_page+0x138/0x240 fs/ext4/inode.c:2206 mpage_process_page_bufs+0x418/0x510 fs/ext4/inode.c:2317 mpage_prepare_extent_to_map+0x489/0xb20 fs/ext4/inode.c:2689 ext4_writepages+0x105f/0x2fd0 fs/ext4/inode.c:2836 do_writepages+0xd0/0x250 mm/page-writeback.c:2364 __filemap_fdatawrite_range+0x23b/0x310 mm/filemap.c:345 file_write_and_wait_range+0x8d/0xe0 mm/filemap.c:655 __generic_file_fsync+0x79/0x1a0 fs/libfs.c:977 ext4_sync_file+0x755/0x12d0 fs/ext4/fsync.c:120 vfs_fsync_range+0x10e/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2675 [inline] ext4_file_write_iter+0x68a/0xe90 fs/ext4/file.c:275 call_write_iter include/linux/fs.h:1777 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x4a7/0x6b0 fs/read_write.c:482 vfs_write+0x198/0x500 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xfd/0x230 fs/read_write.c:582 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 0: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x83/0x2b0 mm/slab.c:3758 mempool_free_slab+0x1e/0x30 mm/mempool.c:457 mempool_free+0xd4/0x1d0 mm/mempool.c:439 bvec_free+0x85/0xa0 block/bio.c:171 bio_free+0xdd/0x1a0 block/bio.c:257 bio_put+0x9d/0xc0 block/bio.c:558 ext4_end_bio+0x15e/0x6b0 fs/ext4/page-io.c:343 bio_endio+0x336/0x690 block/bio.c:1859 req_bio_endio block/blk-core.c:204 [inline] blk_update_request+0x292/0xa10 block/blk-core.c:2763 scsi_end_request+0x82/0xa10 drivers/scsi/scsi_lib.c:659 scsi_io_completion+0xaaa/0x1630 drivers/scsi/scsi_lib.c:885 scsi_finish_command+0x3d0/0x5a0 drivers/scsi/scsi.c:248 scsi_softirq_done+0x2d3/0x370 drivers/scsi/scsi_lib.c:1671 __blk_mq_complete_request+0x31c/0x6e0 block/blk-mq.c:571 blk_mq_complete_request+0x5d/0x70 block/blk-mq.c:591 scsi_mq_done+0x7c/0x2e0 drivers/scsi/scsi_lib.c:1979 virtscsi_complete_cmd+0x532/0x700 drivers/scsi/virtio_scsi.c:207 virtscsi_vq_done+0xa8/0x130 drivers/scsi/virtio_scsi.c:223 virtscsi_req_done+0xa4/0xd0 drivers/scsi/virtio_scsi.c:238 vring_interrupt+0x10f/0x160 drivers/virtio/virtio_ring.c:951 __handle_irq_event_percpu+0x125/0x7f0 kernel/irq/handle.c:147 handle_irq_event_percpu+0x65/0x130 kernel/irq/handle.c:187 handle_irq_event+0xa7/0x134 kernel/irq/handle.c:204 handle_edge_irq+0x22b/0x840 kernel/irq/chip.c:770 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x39/0x50 arch/x86/kernel/irq_64.c:87 do_IRQ+0x99/0x1d0 arch/x86/kernel/irq.c:230 The buggy address belongs to the object at ffff888061129ac0 which belongs to the cache biovec-max of size 8192 The buggy address is located 6720 bytes to the left of 8192-byte region [ffff888061129ac0, ffff88806112bac0) The buggy address belongs to the page: page:ffffea0001844a00 count:1 mapcount:0 mapping:ffff888061129ac0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffff888061129ac0 0000000000000000 0000000100000001 raw: ffffea0002364020 ffffea0001a6e520 ffff8880a8791ac0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888061127f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888061128000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888061128080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888061128100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888061128180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================