Replace kmalloc(count * sizeof(type)) with kmalloc_array() for safer memory
allocation and overflow prevention. Additionally, replace sizeof(type) with
sizeof(*ptr) to improve code robustness.

Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
---
v2: change sizeof(type) to sizeof(*ptr) to improve code robustness as
    suggested by Andy.
---
 drivers/staging/media/atomisp/pci/sh_css.c | 54 +++++++++++-----------
 1 file changed, 28 insertions(+), 26 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/sh_css.c b/drivers/staging/media/atomisp/pci/sh_css.c
index 73bd87f43a8c..61df1bf2bff5 100644
--- a/drivers/staging/media/atomisp/pci/sh_css.c
+++ b/drivers/staging/media/atomisp/pci/sh_css.c
@@ -5821,36 +5821,37 @@ static int ia_css_pipe_create_cas_scaler_desc_single_output(
 		i *= max_scale_factor_per_stage;
 	}
 
-	descr->in_info = kmalloc(descr->num_stage *
-				 sizeof(struct ia_css_frame_info),
-				 GFP_KERNEL);
+	descr->in_info = kmalloc_array(descr->num_stage,
+				       sizeof(*descr->in_info),
+				       GFP_KERNEL);
 	if (!descr->in_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->internal_out_info = kmalloc(descr->num_stage *
-					   sizeof(struct ia_css_frame_info),
-					   GFP_KERNEL);
+	descr->internal_out_info = kmalloc_array(descr->num_stage,
+						 sizeof(*descr->internal_out_info),
+						 GFP_KERNEL);
 	if (!descr->internal_out_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->out_info = kmalloc(descr->num_stage *
-				  sizeof(struct ia_css_frame_info),
-				  GFP_KERNEL);
+	descr->out_info = kmalloc_array(descr->num_stage,
+					sizeof(*descr->out_info),
+					GFP_KERNEL);
 	if (!descr->out_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->vf_info = kmalloc(descr->num_stage *
-				 sizeof(struct ia_css_frame_info),
-				 GFP_KERNEL);
+	descr->vf_info = kmalloc_array(descr->num_stage,
+				       sizeof(*descr->vf_info),
+				       GFP_KERNEL);
 	if (!descr->vf_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->is_output_stage = kmalloc(descr->num_stage * sizeof(bool),
-					 GFP_KERNEL);
+	descr->is_output_stage = kmalloc_array(descr->num_stage,
+					       sizeof(*descr->is_output_stage),
+					       GFP_KERNEL);
 	if (!descr->is_output_stage) {
 		err = -ENOMEM;
 		goto ERR;
@@ -5971,35 +5972,36 @@ ia_css_pipe_create_cas_scaler_desc(struct ia_css_pipe *pipe,
 	descr->num_stage = num_stages;
 
 	descr->in_info = kmalloc_array(descr->num_stage,
-				       sizeof(struct ia_css_frame_info),
+				       sizeof(*descr->in_info),
 				       GFP_KERNEL);
 	if (!descr->in_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->internal_out_info = kmalloc(descr->num_stage *
-					   sizeof(struct ia_css_frame_info),
-					   GFP_KERNEL);
+	descr->internal_out_info = kmalloc_array(descr->num_stage,
+						 sizeof(*descr->internal_out_info),
+						 GFP_KERNEL);
 	if (!descr->internal_out_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->out_info = kmalloc(descr->num_stage *
-				  sizeof(struct ia_css_frame_info),
-				  GFP_KERNEL);
+	descr->out_info = kmalloc_array(descr->num_stage,
+					sizeof(*descr->out_info),
+					GFP_KERNEL);
 	if (!descr->out_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->vf_info = kmalloc(descr->num_stage *
-				 sizeof(struct ia_css_frame_info),
-				 GFP_KERNEL);
+	descr->vf_info = kmalloc_array(descr->num_stage,
+				       sizeof(*descr->vf_info),
+				       GFP_KERNEL);
 	if (!descr->vf_info) {
 		err = -ENOMEM;
 		goto ERR;
 	}
-	descr->is_output_stage = kmalloc(descr->num_stage * sizeof(bool),
-					 GFP_KERNEL);
+	descr->is_output_stage = kmalloc_array(descr->num_stage,
+					       sizeof(*descr->is_output_stage),
+					       GFP_KERNEL);
 	if (!descr->is_output_stage) {
 		err = -ENOMEM;
 		goto ERR;
-- 
2.34.1

On Thu, Aug 21, 2025 at 04:17:42PM +0800, Qianfeng Rong wrote:
> Replace kmalloc(count * sizeof(type)) with kmalloc_array() for safer memory
> allocation and overflow prevention. Additionally, replace sizeof(type) with
> sizeof(*ptr) to improve code robustness.

LGTM, thanks.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>

-- 
With Best Regards,
Andy Shevchenko