Re: [PATCH] dmaengine: dma-jz4780: Use struct_size() in devm_kzalloc()

[Vinod Koul]

On 24-12-18, 00:52, Gustavo A. R. Silva wrote:
> One of the more common cases of allocation size calculations is finding
> the size of a structure that has a zero-sized array at the end, along
> with memory for some number of elements for that array. For example:
> 
> struct foo {
> int stuff;
> void *entry[];
> };
> 
> instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, 
> GFP_KERNEL);
> 
> Instead of leaving these open-coded and prone to type mistakes, we can
> now use the new struct_size() helper:
> 
> instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);
> 
> This issue was detected with the help of Coccinelle.

Applied, thanks

-- 
~Vinod

[PATCH] dmaengine: dma-jz4780: Use struct_size() in devm_kzalloc()

[Gustavo A. R. Silva]

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
int stuff;
void *entry[];
};

instance = devm_kzalloc(dev, sizeof(struct foo) + sizeof(void *) * count, 
GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This issue was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva 
---
 drivers/dma/dma-jz4780.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index a8b6225faa12..9ce0a386225b 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -838,9 +838,8 @@ static int jz4780_dma_probe(struct platform_device *pdev)
if (!soc_data)
return -EINVAL;
 
-   jzdma = devm_kzalloc(dev, sizeof(*jzdma)
-   + sizeof(*jzdma->chan) * soc_data->nb_channels,
-   GFP_KERNEL);
+   jzdma = devm_kzalloc(dev, struct_size(jzdma, chan,
+soc_data->nb_channels), GFP_KERNEL);
if (!jzdma)
return -ENOMEM;
 
-- 
2.20.1