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intel_th: msu-sink: Potential dereference of null pointer
[ Upstream commit82f76a4a72
] The return value of dma_alloc_coherent() needs to be checked. To avoid use of null pointer in sg_set_buf() in case of the failure of alloc. Fixes:f220df66f6
("intel_th: msu-sink: An example msu buffer "sink"") Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Link: https://lore.kernel.org/r/20220705082637.59979-3-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -71,6 +71,9 @@ static int msu_sink_alloc_window(void *data, struct sg_table **sgt, size_t size)
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block = dma_alloc_coherent(priv->dev->parent->parent,
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PAGE_SIZE, &sg_dma_address(sg_ptr),
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GFP_KERNEL);
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if (!block)
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return -ENOMEM;
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sg_set_buf(sg_ptr, block, PAGE_SIZE);
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}
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