| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 037/103] x86/resctrl: Fix potential memory leak | Date | Wed, 22 Jan 2020 10:28:53 +0100 |
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From: Shakeel Butt <shakeelb@google.com>
commit ab6a2114433a3b5b555983dcb9b752a85255f04b upstream.
set_cache_qos_cfg() is leaking memory when the given level is not RDT_RESOURCE_L3 or RDT_RESOURCE_L2. At the moment, this function is called with only valid levels but move the allocation after the valid level checks in order to make it more robust and future proof.
[ bp: Massage commit message. ]
Fixes: 99adde9b370de ("x86/intel_rdt: Enable L2 CDP in MSR IA32_L2_QOS_CFG") Signed-off-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: x86-ml <x86@kernel.org> Link: https://lkml.kernel.org/r/20200102165844.133133-1-shakeelb@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c +++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c @@ -1749,9 +1749,6 @@ static int set_cache_qos_cfg(int level, struct rdt_domain *d; int cpu; - if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) - return -ENOMEM; - if (level == RDT_RESOURCE_L3) update = l3_qos_cfg_update; else if (level == RDT_RESOURCE_L2) @@ -1759,6 +1756,9 @@ static int set_cache_qos_cfg(int level, else return -EINVAL; + if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL)) + return -ENOMEM; + r_l = &rdt_resources_all[level]; list_for_each_entry(d, &r_l->domains, list) { /* Pick one CPU from each domain instance to update MSR */
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