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numa: Fix off-by-one error at MAX_CPUMASK_BITS check 

Fix the CPU index check to ensure we don't go beyond the size of the
node_cpu bitmap.

CPU index is always less than MAX_CPUMASK_BITS, as documented at
sysemu.h:

> The following shall be true for all CPUs:
>   cpu->cpu_index < max_cpus <= MAX_CPUMASK_BITS

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2015-02-12 15:23:48 -02:00
parent 3e5f6234b4
commit ed26b92290
1 changed files with 2 additions and 2 deletions
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numa.c
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@ -76,9 +76,9 @@ static void numa_node_parse(NumaNodeOptions *node, QemuOpts *opts, Error **errp)
} }
for (cpus = node->cpus; cpus; cpus = cpus->next) { for (cpus = node->cpus; cpus; cpus = cpus->next) {
if (cpus->value > MAX_CPUMASK_BITS) { if (cpus->value >= MAX_CPUMASK_BITS) {
error_setg(errp, "CPU number %" PRIu16 " is bigger than %d", error_setg(errp, "CPU number %" PRIu16 " is bigger than %d",
cpus->value, MAX_CPUMASK_BITS); cpus->value, MAX_CPUMASK_BITS - 1);
return; return;
} }
bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1); bitmap_set(numa_info[nodenr].node_cpu, cpus->value, 1);