linux-kernel - [PATCH] tools/power: intel-speed-select: Fix a read overflow in isst_set_tdp_level

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Message-ID: <20190821071403.GG26957@mwanda>
Date:   Wed, 21 Aug 2019 10:14:03 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH] tools/power: intel-speed-select:  Fix a read overflow in
 isst_set_tdp_level_msr()

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: Dan Carpenter <dan.carpenter@...cle.com>
---
 tools/power/x86/intel-speed-select/isst-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/power/x86/intel-speed-select/isst-core.c b/tools/power/x86/intel-speed-select/isst-core.c
index 8de4ac39a008..f724322856ed 100644
--- a/tools/power/x86/intel-speed-select/isst-core.c
+++ b/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;
 
-- 
2.20.1