linux-kernel - [PATCH] thermal: intel: hfi: Improve the type of hfi_features::nr_table

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Message-Id: <20221018112240.25647-1-ricardo.neri-calderon@linux.intel.com>
Date:   Tue, 18 Oct 2022 04:22:40 -0700
From:   Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:     Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Len Brown <len.brown@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Haowen Bai <baihaowen@...zu.com>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] thermal: intel: hfi: Improve the type of hfi_features::nr_table_pages

A Coverity static code scan raised a potential overflow_before_widen
warning when hfi_features::nr_table_pages is used as an argument to
memcpy in intel_hfi_process_event().

Even though the overflow can never happen (the maximum number of pages of
the HFI table is 0x10 and 0x10 << PAGE_SHIFT = 0x10000), using size_t as
the data type of hfi_features::nr_table_pages makes Coverity happy and
matches the data type of the argument 'size' of memcpy().

Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Amit Kucheria <amitk@...nel.org>
Cc: Zhang Rui <rui.zhang@...el.com>
Cc: Len Brown <len.brown@...el.com>
Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Cc: Aubrey Li <aubrey.li@...ux.intel.com>
Cc: Haowen Bai <baihaowen@...zu.com>
Cc: linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
---
 drivers/thermal/intel/intel_hfi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/thermal/intel/intel_hfi.c b/drivers/thermal/intel/intel_hfi.c
index a0640f762dc5..239afe02e518 100644
--- a/drivers/thermal/intel/intel_hfi.c
+++ b/drivers/thermal/intel/intel_hfi.c
@@ -137,7 +137,7 @@ struct hfi_instance {
  * Parameters and supported features that are common to all HFI instances
  */
 struct hfi_features {
-	unsigned int	nr_table_pages;
+	size_t		nr_table_pages;
 	unsigned int	cpu_stride;
 	unsigned int	hdr_size;
 };
-- 
2.25.1