================================================================== BUG: KASAN: slab-out-of-bounds in ntfs_attr_find+0xb48/0xc20 fs/ntfs/attrib.c:611 Read of size 2 at addr ffff888098450a09 by task syz-executor.4/10116 CPU: 0 PID: 10116 Comm: syz-executor.4 Not tainted 4.14.291-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load_n_noabort+0x6b/0x80 mm/kasan/report.c:440 ntfs_attr_find+0xb48/0xc20 fs/ntfs/attrib.c:611 ntfs_attr_lookup+0xeca/0x1f30 fs/ntfs/attrib.c:1207 ntfs_read_inode_mount+0x726/0x2060 fs/ntfs/inode.c:1879 ntfs_fill_super+0x9a6/0x7170 fs/ntfs/super.c:2871 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2572 [inline] do_mount+0xe65/0x2a30 fs/namespace.c:2905 SYSC_mount fs/namespace.c:3121 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3098 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f2509f357aa RSP: 002b:00007f25088a8f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f2509f357aa RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f25088a8fe0 RBP: 00007f25088a9020 R08: 00007f25088a9020 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f25088a8fe0 R15: 0000000020086e00 Allocated by task 9997: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 kmem_cache_alloc+0x124/0x3c0 mm/slab.c:3552 mempool_alloc+0x10e/0x2d0 mm/mempool.c:330 bvec_alloc+0xcc/0x2d0 block/bio.c:216 bio_alloc_bioset+0x585/0x830 block/bio.c:506 bio_alloc include/linux/bio.h:422 [inline] mpage_alloc+0x56/0x2b0 fs/mpage.c:79 __mpage_writepage+0xb48/0x1210 fs/mpage.c:622 write_cache_pages+0x505/0xd20 mm/page-writeback.c:2257 mpage_writepages+0xbe/0x1f0 fs/mpage.c:716 do_writepages+0xc3/0x240 mm/page-writeback.c:2361 __filemap_fdatawrite_range+0x236/0x310 mm/filemap.c:346 file_write_and_wait_range+0x86/0xd0 mm/filemap.c:678 __generic_file_fsync+0x70/0x190 fs/libfs.c:985 fat_file_fsync+0x73/0x1f0 fs/fat/file.c:165 vfs_fsync_range+0x103/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2684 [inline] generic_file_write_iter+0x410/0x650 mm/filemap.c:3212 call_write_iter include/linux/fs.h:1780 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44c/0x630 fs/read_write.c:482 __kernel_write+0xf5/0x330 fs/read_write.c:501 write_pipe_buf+0x143/0x1c0 fs/splice.c:797 splice_from_pipe_feed fs/splice.c:502 [inline] __splice_from_pipe+0x326/0x7a0 fs/splice.c:626 splice_from_pipe fs/splice.c:661 [inline] default_file_splice_write+0xc5/0x150 fs/splice.c:809 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1016 splice_direct_to_actor+0x25a/0x700 fs/splice.c:971 do_splice_direct+0x164/0x210 fs/splice.c:1059 do_sendfile+0x47f/0xb30 fs/read_write.c:1441 SYSC_sendfile64 fs/read_write.c:1496 [inline] SyS_sendfile64+0x9b/0x110 fs/read_write.c:1488 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 9998: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kmem_cache_free+0x7c/0x2b0 mm/slab.c:3758 mempool_free+0xcf/0x1d0 mm/mempool.c:439 bvec_free+0x7d/0xa0 block/bio.c:171 bio_free+0xd1/0x1a0 block/bio.c:257 bio_put+0x59/0x70 block/bio.c:558 bio_endio+0x290/0x690 block/bio.c:1918 req_bio_endio block/blk-core.c:204 [inline] blk_update_request+0x2d0/0xa90 block/blk-core.c:2765 blk_mq_end_request+0x4c/0x1e0 block/blk-mq.c:530 __blk_mq_complete_request+0x30b/0x6c0 block/blk-mq.c:571 blk_mq_complete_request+0x52/0x60 block/blk-mq.c:591 loop_handle_cmd drivers/block/loop.c:1784 [inline] loop_queue_work+0x228/0x21e0 drivers/block/loop.c:1793 kthread_worker_fn+0x271/0x6c0 kernel/kthread.c:667 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 The buggy address belongs to the object at ffff888098451c80 which belongs to the cache biovec-max of size 8192 The buggy address is located 4727 bytes to the left of 8192-byte region [ffff888098451c80, ffff888098453c80) The buggy address belongs to the page: page:ffffea0002611400 count:1 mapcount:0 mapping:ffff888098451c80 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff888098451c80 0000000000000000 0000000100000001 raw: ffffea0002363520 ffffea0002611520 ffff88823a804000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098450900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098450980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888098450a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888098450a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888098450b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================