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dmaengine: stm32-mdma: Use struct_size() helper in devm_kzalloc()

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Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worse scenario, could lead to heap overflows.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210929222922.GA357509@embeddedor
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2021-09-29 17:29:22 -05:00 committed by Vinod Koul
parent 9558cf4ad0
commit ae8f13f0a6
1 changed files with 2 additions and 1 deletions
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3
drivers/dma/stm32-mdma.c
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@ -1566,7 +1566,8 @@ static int stm32_mdma_probe(struct platform_device *pdev)
if (count < 0)
count = 0;
dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev) + sizeof(u32) * count,
dmadev = devm_kzalloc(&pdev->dev,
struct_size(dmadev, ahb_addr_masks, count),
GFP_KERNEL);
if (!dmadev)
return -ENOMEM;