REISERFS (device loop0): journal params: device loop0, size 15748, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30 REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using r5 hash to sort names REISERFS (device loop0): using 3.5.x disk format ================================================================== BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] BUG: KASAN: use-after-free in search_by_entry_key+0xc87/0xf70 fs/reiserfs/namei.c:164 Read of size 4 at addr ffff888078a437bd by task syz-executor757/6355 CPU: 1 PID: 6355 Comm: syz-executor757 Not tainted 4.14.198-syzkaller #0 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+0x1b2/0x283 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x194 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 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0xc87/0xf70 fs/reiserfs/namei.c:164 reiserfs_find_entry.part.0+0x138/0x1200 fs/reiserfs/namei.c:321 reiserfs_find_entry fs/reiserfs/namei.c:367 [inline] reiserfs_lookup+0x1fd/0x400 fs/reiserfs/namei.c:367 lookup_real fs/namei.c:1555 [inline] __lookup_hash fs/namei.c:1575 [inline] __lookup_hash+0x1bb/0x270 fs/namei.c:1563 lookup_one_len+0x279/0x3a0 fs/namei.c:2539 reiserfs_lookup_privroot+0x92/0x270 fs/reiserfs/xattr.c:963 reiserfs_fill_super+0x1ad8/0x28b6 fs/reiserfs/super.c:2179 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:2549 [inline] do_mount+0xe53/0x2a00 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x447d9a RSP: 002b:00007ffdc6a01ba8 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffdc6a01c00 RCX: 0000000000447d9a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffdc6a01bc0 RBP: 00007ffdc6a01bc0 R08: 00007ffdc6a01c00 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000006 R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 The buggy address belongs to the page: page:ffffea0001e290c0 count:0 mapcount:0 mapping: (null) index:0x1 flags: 0xfffe0000000000() raw: 00fffe0000000000 0000000000000000 0000000000000001 00000000ffffffff raw: ffffea0001e29120 ffffea0001e290a0 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888078a43680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888078a43700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888078a43780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888078a43800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888078a43880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================