AuxXxilium/linux_dsm_epyc7002
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f508a5ba7a
linux_dsm_epyc7002/arch
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Thomas Gleixner f508a5ba7a x86/tsc: Prevent NULL pointer deref in calibrate_delay_is_known() 
The topology_core_cpumask is used to find a neighbour cpu in
calibrate_delay_is_known(). It might not be allocated at the first invocation
of that function on the boot cpu, when CONFIG_CPUMASK_OFFSTACK is set.

The mask is allocated later in native_smp_prepare_cpus. As a consequence the
underlying find_next_bit() call dereferences a NULL pointer.

Add a proper check to prevent this.

Fixes: c25323c073 "x86/tsc: Use topology functions"
Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1603180843270.3978@nanos
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-03-18 14:51:06 +01:00
..
alpha arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
arc arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
arm Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
arm64 Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
avr32 arch: Set IORESOURCE_SYSTEM_RAM flag for System RAM 2016-01-30 09:49:57 +01:00
blackfin arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
c6x locking/lockdep: Eliminate lockdep_init() 2016-02-09 12:03:25 +01:00
cris Merge branch 'akpm' (patches from Andrew) 2016-01-21 12:32:08 -08:00
frv dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
h8300 Merge branch 'akpm' (patches from Andrew) 2016-01-21 12:32:08 -08:00
hexagon arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
ia64 Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
m32r Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
m68k m68k/defconfig: Update defconfigs for v4.5-rc1 2016-02-01 10:35:38 +01:00
metag arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
microblaze locking/lockdep: Eliminate lockdep_init() 2016-02-09 12:03:25 +01:00
mips Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
mn10300 arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
nios2 dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
openrisc dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00
parisc Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
powerpc Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
s390 Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
score arch: Set IORESOURCE_SYSTEM_RAM flag for System RAM 2016-01-30 09:49:57 +01:00
sh Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
sparc Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
tile Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-15 13:50:29 -07:00
um um: Export pm_power_off 2016-03-05 22:17:52 +01:00
unicore32 arch: Set IORESOURCE_SYSTEM_RAM flag for System RAM 2016-01-30 09:49:57 +01:00
x86 x86/tsc: Prevent NULL pointer deref in calibrate_delay_is_known() 2016-03-18 14:51:06 +01:00
xtensa arch/hotplug: Call into idle with a proper state 2016-03-01 20:36:57 +01:00
.gitignore
Kconfig dma-mapping: always provide the dma_map_ops based implementation 2016-01-20 17:09:18 -08:00