[PATCH v1] drivers:gt:Switch to use kmemdup_array()

[PATCH v1] drivers:gt:Switch to use kmemdup_array()

[Yu Jiaoliang]

Let the kememdup_array() take care about multiplication and possible
overflows.
Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>
---
 drivers/gpu/drm/i915/gt/intel_workarounds.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 09a287c1aedd..d90348c56765 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -111,8 +111,8 @@ static void wa_init_finish(struct i915_wa_list *wal)
 {
 	/* Trim unused entries. */
 	if (!IS_ALIGNED(wal->count, WA_LIST_CHUNK)) {
-		struct i915_wa *list = kmemdup(wal->list,
-					       wal->count * sizeof(*list),
+		struct i915_wa *list = kmemdup_array(wal->list,
+					       wal->count, sizeof(*list),
 					       GFP_KERNEL);
 
 		if (list) {
-- 
2.34.1

Re: [PATCH v1] drivers:gt:Switch to use kmemdup_array()

[Jani Nikula]

On Tue, 20 Aug 2024, Yu Jiaoliang <yujiaoliang@vivo.com> wrote:
> Let the kememdup_array() take care about multiplication and possible
> overflows.
> Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>

For future reference, please look at git log for the file instead of
inventing subject prefixes.

There should be a blank line between commit message and trailers.

Other than that,

Reviewed-by: Jani Nikula <jani.nikula@intel.com>


> ---
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 09a287c1aedd..d90348c56765 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -111,8 +111,8 @@ static void wa_init_finish(struct i915_wa_list *wal)
>  {
>  	/* Trim unused entries. */
>  	if (!IS_ALIGNED(wal->count, WA_LIST_CHUNK)) {
> -		struct i915_wa *list = kmemdup(wal->list,
> -					       wal->count * sizeof(*list),
> +		struct i915_wa *list = kmemdup_array(wal->list,
> +					       wal->count, sizeof(*list),
>  					       GFP_KERNEL);
>  
>  		if (list) {

-- 
Jani Nikula, Intel

Re: [PATCH v1] drivers:gt:Switch to use kmemdup_array()

[Andi Shyti]

Hi Yi,

Please, next time check with "git drivers/gpu/drm/i915/gt" to
better understand the patch formatting.

The title should be something like:

   drm/i915/gt: Switch to use kmemdup_array()

But sounds more grammatically correct

   drm/i915/gt: Use kmemdup_array instead of kmemdup for multiple allocation

On Tue, Aug 20, 2024 at 03:45:03PM +0800, Yu Jiaoliang wrote:
> Let the kememdup_array() take care about multiplication and possible
> overflows.

Leave one blank line between the commit log and the tag section

> Signed-off-by: Yu Jiaoliang <yujiaoliang@vivo.com>
> ---
>  drivers/gpu/drm/i915/gt/intel_workarounds.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> index 09a287c1aedd..d90348c56765 100644
> --- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
> +++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
> @@ -111,8 +111,8 @@ static void wa_init_finish(struct i915_wa_list *wal)
>  {
>  	/* Trim unused entries. */
>  	if (!IS_ALIGNED(wal->count, WA_LIST_CHUNK)) {
> -		struct i915_wa *list = kmemdup(wal->list,
> -					       wal->count * sizeof(*list),
> +		struct i915_wa *list = kmemdup_array(wal->list,
> +					       wal->count, sizeof(*list),
>  					       GFP_KERNEL);

Here you are not aligning correctly. Everything should be aligned
to one character after the open parenthesis; for example:

		struct i915_wa *list = kmemdup_array(wal->list, wal->count,
						     sizeof(*list), GFP_KERNEL);

Patch is good, though looking forward to receiving v2.

Thanks,
Andi

>  
>  		if (list) {
> -- 
> 2.34.1