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staging: emxx_udc: Add checks for dma_alloc_coherent()
[ Upstream commit f6510a93cf
]
As the dma_alloc_coherent may return NULL, the return value needs to be
checked to avoid NULL poineter dereference.
Signed-off-by: Yuan Can <yuancan@huawei.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Link: https://lore.kernel.org/r/20230119083119.16956-1-yuancan@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 6 additions and 1 deletions
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@ -2590,10 +2590,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep,
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req->unaligned = false;
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if (req->unaligned) {
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if (!ep->virt_buf)
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if (!ep->virt_buf) {
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ep->virt_buf = dma_alloc_coherent(udc->dev, PAGE_SIZE,
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&ep->phys_buf,
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GFP_ATOMIC | GFP_DMA);
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if (!ep->virt_buf) {
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spin_unlock_irqrestore(&udc->lock, flags);
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return -ENOMEM;
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}
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}
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if (ep->epnum > 0) {
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if (ep->direct == USB_DIR_IN)
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memcpy(ep->virt_buf, req->req.buf,
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