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x86_energy_perf_policy: Harden update_cpufreq_scaling_freq()

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Protect update_cpufreq_scaling_freq() from buffer overflow
if somehow it was called with a huge CPU number.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Len Brown 2026-05-06 10:00:00 -04:00
parent 481006fbcb
commit 74bd795c99
1 changed files with 2 additions and 2 deletions
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4
tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
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@ -1167,12 +1167,12 @@ int ratio_2_sysfs_khz(int ratio)
*/
void update_cpufreq_scaling_freq(int is_max, int cpu, unsigned int ratio)
{
char pathname[64];
char pathname[96];
FILE *fp;
int retval;
int khz;
sprintf(pathname, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_%s_freq", cpu, is_max ? "max" : "min");
snprintf(pathname, sizeof(pathname), "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_%s_freq", cpu, is_max ? "max" : "min");
fp = fopen(pathname, "w");
if (!fp) {