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dmaengine: zynqmp_dma: In struct zynqmp_dma_chan fix desc_size data type

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[ Upstream commit f9a9f43a62a04ec3183fb0da9226c7706eed0115 ]

In zynqmp_dma_alloc/free_chan_resources functions there is a
potential overflow in the below expressions.

dma_alloc_coherent(chan->dev, (2 * chan->desc_size *
		   ZYNQMP_DMA_NUM_DESCS),
		   &chan->desc_pool_p, GFP_KERNEL);

dma_free_coherent(chan->dev,(2 * ZYNQMP_DMA_DESC_SIZE(chan) *
                 ZYNQMP_DMA_NUM_DESCS),
                chan->desc_pool_v, chan->desc_pool_p);

The arguments desc_size and ZYNQMP_DMA_NUM_DESCS were 32 bit. Though
this overflow condition is not observed but it is a potential problem
in the case of 32-bit multiplication. Hence fix it by changing the
desc_size data type to size_t.

In addition to coverity fix it also reuse ZYNQMP_DMA_DESC_SIZE macro in
dma_alloc_coherent API argument.

Addresses-Coverity: Event overflow_before_widen.
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/1652166762-18317-2-git-send-email-radhey.shyam.pandey@xilinx.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Radhey Shyam Pandey 2022-05-10 12:42:40 +05:30 committed by Greg Kroah-Hartman
parent 4917e43bca
commit 83960276ff
1 changed files with 3 additions and 2 deletions
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5
drivers/dma/xilinx/zynqmp_dma.c
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@ -232,7 +232,7 @@ struct zynqmp_dma_chan {
bool is_dmacoherent;
struct tasklet_struct tasklet;
bool idle;
u32 desc_size;
size_t desc_size;
bool err;
u32 bus_width;
u32 src_burst_len;
@ -489,7 +489,8 @@ static int zynqmp_dma_alloc_chan_resources(struct dma_chan *dchan)
}
chan->desc_pool_v = dma_alloc_coherent(chan->dev,
(2 * chan->desc_size * ZYNQMP_DMA_NUM_DESCS),
(2 * ZYNQMP_DMA_DESC_SIZE(chan) *
ZYNQMP_DMA_NUM_DESCS),
&chan->desc_pool_p, GFP_KERNEL);
if (!chan->desc_pool_v)
return -ENOMEM;