cpupower tools: Fix malloc of cpu_info structure

The cpu_info member of cpupower_topology was being declared as an unnamed
structure. This member was then being malloced using the size of the
parent cpupower_topology * the number of cpus. This works
because cpu_info is smaller than cpupower_topology. However, there is
no guarantee that will always be the case. Making cpu_info its own
top level structure (named cpuid_core_info) allows for mallocing the actual
size of this structure. This also lets us get rid of a redefinition of
the structure in topology.c with slightly different field names.

Signed-off-by: Palmer Cox <p@lmercox.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 12 insertions, 19 deletions

diff --git a/tools/power/cpupower/utils/helpers/helpers.h b/tools/power/cpupower/utils/helpers/helpers.h
index 2eb584cf2f55..f84985f630e2 100644
--- a/tools/power/cpupower/utils/helpers/helpers.h
+++ b/tools/power/cpupower/utils/helpers/helpers.h
@@ -92,6 +92,14 @@ extern int get_cpu_info(unsigned int cpu, struct cpupower_cpu_info *cpu_info);
 extern struct cpupower_cpu_info cpupower_cpu_info;
 /* cpuid and cpuinfo helpers  **************************/
 
+struct cpuid_core_info {
+        int pkg;
+        int core;
+        int cpu;
+
+        /* flags */
+        unsigned int is_online:1;
+};
 
 /* CPU topology/hierarchy parsing ******************/
 struct cpupower_topology {
@@ -101,14 +109,7 @@ struct cpupower_topology {
         unsigned int threads; /* per core */
 
         /* Array gets mallocated with cores entries, holding per core info */
-        struct {
-                int pkg;
-                int core;
-                int cpu;
-
-                /* flags */
-                unsigned int is_online:1;
-        } *core_info;
+        struct cpuid_core_info *core_info;
 };
 
 extern int get_cpu_topology(struct cpupower_topology *cpu_top);
diff --git a/tools/power/cpupower/utils/helpers/topology.c b/tools/power/cpupower/utils/helpers/topology.c
index 216f3e3466ce..4e2b583ea17b 100644
--- a/tools/power/cpupower/utils/helpers/topology.c
+++ b/tools/power/cpupower/utils/helpers/topology.c
@@ -36,14 +36,6 @@ static int sysfs_topology_read_file(unsigned int cpu, const char *fname, int *re
         return 0;
 }
 
-struct cpuid_core_info {
-        unsigned int pkg;
-        unsigned int thread;
-        unsigned int cpu;
-        /* flags */
-        unsigned int is_online:1;
-};
-
 static int __compare(const void *t1, const void *t2)
 {
         struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1;
@@ -52,9 +44,9 @@ static int __compare(const void *t1, const void *t2)
                 return -1;
         else if (top1->pkg > top2->pkg)
                 return 1;
-        else if (top1->thread < top2->thread)
+        else if (top1->core < top2->core)
                 return -1;
-        else if (top1->thread > top2->thread)
+        else if (top1->core > top2->core)
                 return 1;
         else if (top1->cpu < top2->cpu)
                 return -1;
@@ -74,7 +66,7 @@ int get_cpu_topology(struct cpupower_topology *cpu_top)
 {
         int cpu, cpus = sysconf(_SC_NPROCESSORS_CONF);
 
-        cpu_top->core_info = malloc(sizeof(struct cpupower_topology) * cpus);
+        cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus);
         if (cpu_top->core_info == NULL)
                 return -ENOMEM;
         cpu_top->pkgs = cpu_top->cores = 0;