linux-kernel - [PATCH] tools/power/x86/intel-speed-select: Fix off by one check

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Date:   Mon, 18 Jul 2022 16:17:17 +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
Subject: [PATCH] tools/power/x86/intel-speed-select: Fix off by one check

Change > MAX_DIE_PER_PACKAGE to >= MAX_DIE_PER_PACKAGE to prevent
accessing one element beyond the end of the array.

Fixes: 7fd786dfbd2c ("tools/power/x86/intel-speed-select: OOB daemon mode")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 tools/power/x86/intel-speed-select/isst-daemon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/power/x86/intel-speed-select/isst-daemon.c b/tools/power/x86/intel-speed-select/isst-daemon.c
index dd372924bc82..d0400c6684ba 100644
--- a/tools/power/x86/intel-speed-select/isst-daemon.c
+++ b/tools/power/x86/intel-speed-select/isst-daemon.c
@@ -41,7 +41,7 @@ void process_level_change(int cpu)
 	time_t tm;
 	int ret;
 
-	if (pkg_id >= MAX_PACKAGE_COUNT || die_id > MAX_DIE_PER_PACKAGE) {
+	if (pkg_id >= MAX_PACKAGE_COUNT || die_id >= MAX_DIE_PER_PACKAGE) {
 		debug_printf("Invalid package/die info for cpu:%d\n", cpu);
 		return;
 	}
-- 
2.35.1