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

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

[Dan Carpenter]

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@linaro.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

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

[Ilpo Järvinen]

On Thu, 29 Feb 2024 16:11:36 +0300, Dan Carpenter wrote:

> 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.
> 
> 


Thank you for your contribution, it has been applied to my local
review-ilpo branch. Note it will show up in the public
platform-drivers-x86/review-ilpo branch only once I've pushed my
local branch there, which might take a while.

The list of commits applied:
[1/1] platform/mellanox: mlxbf-pmc: fix signedness bugs
      commit: d22168db08c4c8e6c5e25fa3570f50f0f2ff1ef1

--
 i.

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

[Ilpo Järvinen]

On Thu, 29 Feb 2024, Dan Carpenter wrote:

> 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@linaro.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.

Hi,

While this patch itself was fine so I applied it, when reviewing the patch 
I noticed that some of the kstrtouint() derived values were not properly 
bound checked (some were fed directly to FIELD_PREP()).

-- 
 i.