linux-kernel - [PATCH] platform/mellanox: mlxbf-pmc: fix signedness bugs

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Date: Thu, 29 Feb 2024 16:11:36 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Shravan Kumar Ramani <shravankr@...dia.com>
Cc: Hans de Goede <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Vadim Pasternak <vadimp@...dia.com>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH] platform/mellanox: mlxbf-pmc: fix signedness bugs

These need to be signed for the error handling to work.  The
mlxbf_pmc_get_event_num() function returns int so int type is correct.

Fixes: 1ae9ffd303c2 ("platform/mellanox: mlxbf-pmc: Cleanup signed/unsigned mix-up")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
The code in mlxbf_pmc_valid_range() has a check for negatives but that
has a signedness bug too.  Fortunately "(u32)-EINVAL + 8" will not
result in an integer overflow so the offset is treated as invalid.

 drivers/platform/mellanox/mlxbf-pmc.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/mellanox/mlxbf-pmc.c b/drivers/platform/mellanox/mlxbf-pmc.c
index 250405bb59a7..bc91423c96b9 100644
--- a/drivers/platform/mellanox/mlxbf-pmc.c
+++ b/drivers/platform/mellanox/mlxbf-pmc.c
@@ -1496,8 +1496,9 @@ static ssize_t mlxbf_pmc_counter_show(struct device *dev,
 {
 	struct mlxbf_pmc_attribute *attr_counter = container_of(
 		attr, struct mlxbf_pmc_attribute, dev_attr);
-	unsigned int blk_num, cnt_num, offset;
+	unsigned int blk_num, cnt_num;
 	bool is_l3 = false;
+	int offset;
 	u64 value;
 
 	blk_num = attr_counter->nr;
@@ -1530,9 +1531,10 @@ static ssize_t mlxbf_pmc_counter_store(struct device *dev,
 {
 	struct mlxbf_pmc_attribute *attr_counter = container_of(
 		attr, struct mlxbf_pmc_attribute, dev_attr);
-	unsigned int blk_num, cnt_num, offset, data;
+	unsigned int blk_num, cnt_num, data;
 	bool is_l3 = false;
 	u64 evt_num;
+	int offset;
 	int err;
 
 	blk_num = attr_counter->nr;
@@ -1612,8 +1614,9 @@ static ssize_t mlxbf_pmc_event_store(struct device *dev,
 {
 	struct mlxbf_pmc_attribute *attr_event = container_of(
 		attr, struct mlxbf_pmc_attribute, dev_attr);
-	unsigned int blk_num, cnt_num, evt_num;
+	unsigned int blk_num, cnt_num;
 	bool is_l3 = false;
+	int evt_num;
 	int err;
 
 	blk_num = attr_event->nr;
-- 
2.43.0