* [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc()
@ 2021-09-28 22:22 Gustavo A. R. Silva
2021-10-21 17:01 ` Kees Cook
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Gustavo A. R. Silva @ 2021-09-28 22:22 UTC (permalink / raw)
To: Joerg Roedel, Will Deacon
Cc: iommu, linux-kernel, Gustavo A. R. Silva, linux-hardening
Use 2-factor argument form kvcalloc() instead of kvzalloc().
Link: https://github.com/KSPP/linux/issues/162
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
drivers/iommu/dma-iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 896bea04c347..18c6edbe5fbf 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -616,7 +616,7 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
if (!order_mask)
return NULL;
- pages = kvzalloc(count * sizeof(*pages), GFP_KERNEL);
+ pages = kvcalloc(count, sizeof(*pages), GFP_KERNEL);
if (!pages)
return NULL;
--
2.27.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc()
2021-09-28 22:22 [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc() Gustavo A. R. Silva
@ 2021-10-21 17:01 ` Kees Cook
2021-10-21 17:50 ` Robin Murphy
2021-10-27 8:05 ` Joerg Roedel
2 siblings, 0 replies; 4+ messages in thread
From: Kees Cook @ 2021-10-21 17:01 UTC (permalink / raw)
To: Gustavo A. R. Silva
Cc: Joerg Roedel, Will Deacon, iommu, linux-kernel, linux-hardening
On Tue, Sep 28, 2021 at 05:22:29PM -0500, Gustavo A. R. Silva wrote:
> Use 2-factor argument form kvcalloc() instead of kvzalloc().
>
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Looks right.
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc()
2021-09-28 22:22 [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc() Gustavo A. R. Silva
2021-10-21 17:01 ` Kees Cook
@ 2021-10-21 17:50 ` Robin Murphy
2021-10-27 8:05 ` Joerg Roedel
2 siblings, 0 replies; 4+ messages in thread
From: Robin Murphy @ 2021-10-21 17:50 UTC (permalink / raw)
To: Gustavo A. R. Silva, Joerg Roedel, Will Deacon
Cc: iommu, linux-hardening, linux-kernel
On 2021-09-28 23:22, Gustavo A. R. Silva wrote:
> Use 2-factor argument form kvcalloc() instead of kvzalloc().
If we have a thing for that now, then sure, why not. FWIW this can't
ever overflow due to where "count" comes from, but it has no reason to
be special.
Acked-by: Robin Murphy <robin.murphy@arm.com>
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> drivers/iommu/dma-iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index 896bea04c347..18c6edbe5fbf 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -616,7 +616,7 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
> if (!order_mask)
> return NULL;
>
> - pages = kvzalloc(count * sizeof(*pages), GFP_KERNEL);
> + pages = kvcalloc(count, sizeof(*pages), GFP_KERNEL);
> if (!pages)
> return NULL;
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc()
2021-09-28 22:22 [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc() Gustavo A. R. Silva
2021-10-21 17:01 ` Kees Cook
2021-10-21 17:50 ` Robin Murphy
@ 2021-10-27 8:05 ` Joerg Roedel
2 siblings, 0 replies; 4+ messages in thread
From: Joerg Roedel @ 2021-10-27 8:05 UTC (permalink / raw)
To: Gustavo A. R. Silva; +Cc: Will Deacon, iommu, linux-kernel, linux-hardening
On Tue, Sep 28, 2021 at 05:22:29PM -0500, Gustavo A. R. Silva wrote:
> Use 2-factor argument form kvcalloc() instead of kvzalloc().
>
> Link: https://github.com/KSPP/linux/issues/162
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> drivers/iommu/dma-iommu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Applied, thanks.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-09-28 22:22 [PATCH][next] iommu/dma: Use kvcalloc() instead of kvzalloc() Gustavo A. R. Silva
2021-10-21 17:01 ` Kees Cook
2021-10-21 17:50 ` Robin Murphy
2021-10-27 8:05 ` Joerg Roedel
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