From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> [ Upstream commit bc04a049f058a472695aa22905d57e2b1f4c77d9 ] When CONFIG_DEBUG_PER_CPU_MAPS=y we validate that the @node argument of cpumask_of_node() is a valid node_id. It however forgets to check for negative numbers. Fix this by explicitly casting to unsigned int. (unsigned)node >= nr_node_ids verifies: 0 <= node < nr_node_ids Also ammend the error message to match the condition. Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Yunsheng Lin <linyunsheng@xxxxxxxxxx> Link: https://lkml.kernel.org/r/20190903075352.GY2369@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- arch/x86/mm/numa.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index e6dad600614c2..4123100e0eafe 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -861,9 +861,9 @@ void numa_remove_cpu(int cpu) */ const struct cpumask *cpumask_of_node(int node) { - if (node >= nr_node_ids) { + if ((unsigned)node >= nr_node_ids) { printk(KERN_WARNING - "cpumask_of_node(%d): node > nr_node_ids(%u)\n", + "cpumask_of_node(%d): (unsigned)node >= nr_node_ids(%u)\n", node, nr_node_ids); dump_stack(); return cpu_none_mask; -- 2.20.1
