tools/power/x86/intel-speed-select: Fix a read overflow in isst_set_tdp_level_msr()

task #29499913

commit 010764b8856e5ee5056113704dc4b914ebc88f1d upstream

The isst_send_msr_command() function will read 8 bytes but we are
passing an address to an int (4 bytes) so it results in a read overflow.

Fixes: 3fb4f7cd472c ("tools/power/x86: A tool to validate Intel Speed Select commands")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Acked-by: NSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NErwei Deng <erwei@linux.alibaba.com>
Reviewed-by: NArtie Ding <artie.ding@linux.alibaba.com>

tools/power/x86/intel-speed-select/isst-core.c

@@ -190,6 +190,7 @@ int isst_get_get_trl(int cpu, int level, int avx_level, int *trl)
 
 int isst_set_tdp_level_msr(int cpu, int tdp_level)
 {
+	unsigned long long level = tdp_level;
 	int ret;
 
 	debug_printf("cpu: tdp_level via MSR %d\n", cpu, tdp_level);
@@ -202,8 +203,7 @@ int isst_set_tdp_level_msr(int cpu, int tdp_level)
 	if (tdp_level > 2)
 		return -1; /* invalid value */
 
-	ret = isst_send_msr_command(cpu, 0x64b, 1,
-				    (unsigned long long *)&tdp_level);
+	ret = isst_send_msr_command(cpu, 0x64b, 1, &level);
 	if (ret)
 		return ret;