XFS (loop2): Mounting V4 Filesystem ================================================================== BUG: KASAN: use-after-free in xlog_alloc_log+0x11cb/0x1390 fs/xfs/xfs_log.c:1495 Read of size 8 at addr ffff888095bb2090 by task syz-executor.2/30883 CPU: 0 PID: 30883 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 print_address_description+0x75/0x5c0 mm/kasan/report.c:374 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506 kasan_report+0x26/0x50 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 xlog_alloc_log+0x11cb/0x1390 fs/xfs/xfs_log.c:1495 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:599 xfs_mountfs+0xbf1/0x1bb0 fs/xfs/xfs_mount.c:811 xfs_fs_fill_super+0x1099/0x14e0 fs/xfs/xfs_super.c:1732 mount_bdev+0x27c/0x390 fs/super.c:1415 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1806 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:647 vfs_get_tree+0x8b/0x2a0 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x16bb/0x24f0 fs/namespace.c:3142 ksys_mount+0xcc/0x100 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3362 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d0ca Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fd300ffda88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd300ffdb40 RCX: 000000000045d0ca RDX: 00007fd300ffdae0 RSI: 0000000020000000 RDI: 00007fd300ffdb00 RBP: 0000000000000001 R08: 00007fd300ffdb40 R09: 00007fd300ffdae0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 00000000004ca26c R14: 00000000004e28a8 R15: 00000000ffffffff Allocated by task 30883: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:510 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x254/0x340 mm/slab.c:3664 kmalloc include/linux/slab.h:561 [inline] kmem_alloc+0x57f/0x680 fs/xfs/kmem.c:21 kmem_zalloc fs/xfs/kmem.h:68 [inline] xlog_alloc_log+0x5a0/0x1390 fs/xfs/xfs_log.c:1437 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:599 xfs_mountfs+0xbf1/0x1bb0 fs/xfs/xfs_mount.c:811 xfs_fs_fill_super+0x1099/0x14e0 fs/xfs/xfs_super.c:1732 mount_bdev+0x27c/0x390 fs/super.c:1415 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1806 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:647 vfs_get_tree+0x8b/0x2a0 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x16bb/0x24f0 fs/namespace.c:3142 ksys_mount+0xcc/0x100 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3362 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 30883: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x115/0x200 mm/slab.c:3756 kvfree+0x47/0x50 mm/util.c:593 kmem_free fs/xfs/kmem.h:61 [inline] xlog_alloc_log+0x1209/0x1390 fs/xfs/xfs_log.c:1497 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:599 xfs_mountfs+0xbf1/0x1bb0 fs/xfs/xfs_mount.c:811 xfs_fs_fill_super+0x1099/0x14e0 fs/xfs/xfs_super.c:1732 mount_bdev+0x27c/0x390 fs/super.c:1415 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1806 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:647 vfs_get_tree+0x8b/0x2a0 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x16bb/0x24f0 fs/namespace.c:3142 ksys_mount+0xcc/0x100 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3362 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888095bb2000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 144 bytes inside of 1024-byte region [ffff888095bb2000, ffff888095bb2400) The buggy address belongs to the page: page:ffffea000256ec80 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 raw: 00fffe0000000200 ffffea000260eac8 ffffea0002956b48 ffff8880aa400c40 raw: 0000000000000000 ffff888095bb2000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888095bb1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888095bb2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888095bb2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888095bb2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888095bb2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================