tools/power turbostat: Set per_cpu_msr_sum to NULL after free

Emily Ehlert · lenb · commit 2313b97bc0cc · 2025-12-02T15:58:30.000-05:00
Set per_cpu_msr_sum to NULL after freeing it in the error path
of msr_sum_record() to prevent potential use-after-free issues.

Signed-off-by: Emily Ehlert &lt;ehemily@amazon.com&gt;
Signed-off-by: Len Brown &lt;len.brown@intel.com&gt;
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
@@ -6652,6 +6652,7 @@ void msr_sum_record(void)
 	timer_delete(timerid);
 release_msr:
 	free(per_cpu_msr_sum);
+	per_cpu_msr_sum = NULL;
 }
 
 /*

Original file line number	Diff line number	Diff line change
`@@ -6652,6 +6652,7 @@ void msr_sum_record(void)`
`6652`	`6652`	`timer_delete(timerid);`
`6653`	`6653`	`release_msr:`
`6654`	`6654`	`free(per_cpu_msr_sum);`
	`6655`	`+ per_cpu_msr_sum = NULL;`
`6655`	`6656`	`}`
`6656`	`6657`
`6657`	`6658`	`/*`