Prarit Bhargava c7563e62a6 x86/resctrl: Prevent NULL pointer dereference when local MBM is disabled ... Booting with kernel parameter "rdt=cmt,mbmtotal,memlocal,l3cat,mba" and executing "mount -t resctrl resctrl -o mba_MBps /sys/fs/resctrl" results in a NULL pointer dereference on systems which do not have local MBM support enabled.. BUG: kernel NULL pointer dereference, address: 0000000000000020 PGD 0 P4D 0 Oops: 0000 [#1] SMP PTI CPU: 0 PID: 722 Comm: kworker/0:3 Not tainted 5.2.0-0.rc3.git0.1.el7_UNSUPPORTED.x86_64 #2 Workqueue: events mbm_handle_overflow RIP: 0010:mbm_handle_overflow+0x150/0x2b0 Only enter the bandwith update loop if the system has local MBM enabled. Fixes: de73f38f76 ("x86/intel_rdt/mba_sc: Feedback loop to dynamically update mem bandwidth") Signed-off-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/20190610171544.13474-1-prarit@redhat.com		2019-06-12 10:31:50 +02:00
..
core.c	x86/resctrl: Fix rdt_find_domain() return value and checks	2018-12-11 22:09:28 +01:00
ctrlmondata.c	x86/resctrl: Initialize a new resource group with default MBA values	2019-04-18 00:06:31 +02:00
internal.h	kernfs, sysfs, cgroup, intel_rdt: Support fs_context	2019-02-28 03:29:34 -05:00
Makefile	x86/resctrl: Avoid confusion over the new X86_RESCTRL config	2019-02-02 10:34:52 +01:00
monitor.c	x86/resctrl: Prevent NULL pointer dereference when local MBM is disabled	2019-06-12 10:31:50 +02:00
pseudo_lock_event.h
pseudo_lock.c	x86/resctrl: Remove duplicate MSR_MISC_FEATURE_CONTROL definition	2019-02-05 07:21:56 +01:00
rdtgroup.c	x86/resctrl: Don't stop walking closids when a locksetup group is found	2019-06-12 10:31:50 +02:00