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Date: Wed, 29 Sep 2021 17:29:22 -0500 From: "Gustavo A. R. Silva" <gustavoars@...nel.org> To: Vinod Koul <vkoul@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com> Cc: dmaengine@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-hardening@...r.kernel.org Subject: [PATCH][next] dmaengine: stm32-mdma: Use struct_size() helper in devm_kzalloc() 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@...nel.org> --- drivers/dma/stm32-mdma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c index 18cbd1e43c2e..d30a4a28d3bf 100644 --- a/drivers/dma/stm32-mdma.c +++ b/drivers/dma/stm32-mdma.c @@ -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; -- 2.27.0
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