CVE-2025-71135

In the Linux kernel, the following vulnerability has been resolved:

md/raid5: fix possible null-pointer dereferences in raid5storegroupthreadcnt()

The variable mddev->private is first assigned to conf and then checked:

conf = mddev->private; if (!conf) ...

If conf is NULL, then mddev->private is also NULL. In this case, null-pointer dereferences can occur when calling raid5_quiesce():

raid5quiesce(mddev, true); raid5quiesce(mddev, false);

since mddev->private is assigned to conf again in raid5_quiesce(), and conf is dereferenced in several places, for example:

conf->quiesce = 0; wakeup(&conf->waitfor_quiescent);

To fix this issue, the function should unlock mddev and return before invoking raid5quiesce() when conf is NULL, following the existing pattern in raid5changeconsistencypolicy().