CVE-2025-71107

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> f2fs: ensure node page reads complete before f2fs_put_super() finishes<br /> <br /> Xfstests generic/335, generic/336 sometimes crash with the following message:<br /> <br /> F2FS-fs (dm-0): detect filesystem reference count leak during umount, type: 9, count: 1<br /> ------------[ cut here ]------------<br /> kernel BUG at fs/f2fs/super.c:1939!<br /> Oops: invalid opcode: 0000 [#1] SMP NOPTI<br /> CPU: 1 UID: 0 PID: 609351 Comm: umount Tainted: G W 6.17.0-rc5-xfstests-g9dd1835ecda5 #1 PREEMPT(none)<br /> Tainted: [W]=WARN<br /> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014<br /> RIP: 0010:f2fs_put_super+0x3b3/0x3c0<br /> Call Trace:<br /> <br /> generic_shutdown_super+0x7e/0x190<br /> kill_block_super+0x1a/0x40<br /> kill_f2fs_super+0x9d/0x190<br /> deactivate_locked_super+0x30/0xb0<br /> cleanup_mnt+0xba/0x150<br /> task_work_run+0x5c/0xa0<br /> exit_to_user_mode_loop+0xb7/0xc0<br /> do_syscall_64+0x1ae/0x1c0<br /> entry_SYSCALL_64_after_hwframe+0x76/0x7e<br /> <br /> ---[ end trace 0000000000000000 ]---<br /> <br /> It appears that sometimes it is possible that f2fs_put_super() is called before<br /> all node page reads are completed.<br /> Adding a call to f2fs_wait_on_all_pages() for F2FS_RD_NODE fixes the problem.