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 ffff88806672818a by task syz-executor.0/29708 CPU: 1 PID: 29708 Comm: syz-executor.0 Not tainted 5.8.0-rc2-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:3299 __generic_file_write_iter+0x22b/0x4e0 mm/filemap.c:3428 generic_file_write_iter+0x4a6/0x650 mm/filemap.c:3460 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write fs/read_write.c:484 [inline] __vfs_write+0x52f/0x6e0 fs/read_write.c:497 __kernel_write+0x120/0x350 fs/read_write.c:516 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 get_signal+0x13cf/0x1d60 kernel/signal.c:2739 do_signal+0x33/0x610 arch/x86/kernel/signal.c:810 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline] __prepare_exit_to_usermode+0xd7/0x1e0 arch/x86/entry/common.c:246 do_syscall_64+0x7f/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cb19 Code: Bad RIP value. RSP: 002b:00007f46a6d12cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000078c0e8 RCX: 000000000045cb19 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000078c0ec RBP: 000000000078c0e0 R08: 0000000000000009 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000078c0ec R13: 00007ffef54dc25f R14: 00007f46a6d139c0 R15: 000000000078c0ec The buggy address belongs to the page: page:ffffea000199ca00 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 flags: 0xfffe0000000000() raw: 00fffe0000000000 ffffea000198d308 ffffea0001975b08 0000000000000000 raw: 0000000000000001 0000000000000001 00000000ffffff7f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888066728080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888066728100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888066728180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888066728200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888066728280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================