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Date: Fri, 1 Oct 2021 09:14:58 +0200 From: Amelie DELAUNAY <amelie.delaunay@...s.st.com> To: "Gustavo A. R. Silva" <gustavoars@...nel.org>, 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>, <linux-hardening@...r.kernel.org> Subject: Re: [PATCH][next] dmaengine: stm32-mdma: Use struct_size() helper in devm_kzalloc() On 9/30/21 12:29 AM, Gustavo A. R. Silva wrote: > 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> Reviewed-by: Amelie Delaunay <amelie.delaunay@...s.st.com> > --- > 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; >
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