MINIX-fs: mounting unchecked file system, running fsck is recommended Process accounting resumed ================================================================== BUG: KASAN: use-after-free in add_chain fs/minix/itree_common.c:14 [inline] BUG: KASAN: use-after-free in get_branch fs/minix/itree_common.c:52 [inline] BUG: KASAN: use-after-free in get_block+0x69a/0x1600 fs/minix/itree_common.c:160 Read of size 2 at addr ffff88808c5c118a by task syz-executor273/6776 CPU: 0 PID: 6776 Comm: syz-executor273 Not tainted 5.8.0-rc4-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+0x1f0/0x31e lib/dump_stack.c:118 print_address_description+0x66/0x5a0 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report+0x132/0x1d0 mm/kasan/report.c:530 add_chain fs/minix/itree_common.c:14 [inline] get_branch fs/minix/itree_common.c:52 [inline] get_block+0x69a/0x1600 fs/minix/itree_common.c:160 __block_write_begin_int+0x708/0x1a00 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_write_begin+0x59/0x280 fs/buffer.c:2121 minix_write_begin+0x38/0x1f0 fs/minix/inode.c:412 generic_perform_write+0x23b/0x4e0 mm/filemap.c:3318 __generic_file_write_iter+0x22b/0x4e0 mm/filemap.c:3447 generic_file_write_iter+0x4a6/0x650 mm/filemap.c:3479 call_write_iter include/linux/fs.h:1908 [inline] new_sync_write fs/read_write.c:503 [inline] __kernel_write+0x85b/0xa60 fs/read_write.c:530 do_acct_process+0xec6/0x12b0 kernel/acct.c:522 slow_acct_process kernel/acct.c:581 [inline] acct_process+0x398/0x4a0 kernel/acct.c:607 do_exit+0x593/0x1f80 kernel/exit.c:795 do_group_exit+0x161/0x2d0 kernel/exit.c:903 __do_sys_exit_group+0x13/0x20 kernel/exit.c:914 __se_sys_exit_group+0x10/0x10 kernel/exit.c:912 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:912 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x446c88 Code: Bad RIP value. RSP: 002b:00007fff791accb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000446c88 RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 RBP: 00000000004ca370 R08: 00000000000000e7 R09: ffffffffffffffd4 R10: 00007fff791acbd0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006dda40 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0002317040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 flags: 0xfffe0000000000() raw: 00fffe0000000000 ffffea00022fe388 ffffea0002315e88 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808c5c1080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88808c5c1100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88808c5c1180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88808c5c1200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88808c5c1280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================