From: Yuan Can <yuancan@xxxxxxxxxx> [ Upstream commit f6510a93cfd8c6c79b4dda0f2967cdc6df42eff4 ] 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@xxxxxxxxxx> Reviewed-by: Simon Horman <horms@xxxxxxxxxxxx> Link: https://lore.kernel.org/r/20230119083119.16956-1-yuancan@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/staging/emxx_udc/emxx_udc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c index 3897f8e8f5e0d..6870a33d4ccf3 100644 --- a/drivers/staging/emxx_udc/emxx_udc.c +++ b/drivers/staging/emxx_udc/emxx_udc.c @@ -2591,10 +2591,15 @@ static int nbu2ss_ep_queue(struct usb_ep *_ep, req->unaligned = false; if (req->unaligned) { - if (!ep->virt_buf) + if (!ep->virt_buf) { ep->virt_buf = dma_alloc_coherent(udc->dev, PAGE_SIZE, &ep->phys_buf, GFP_ATOMIC | GFP_DMA); + if (!ep->virt_buf) { + spin_unlock_irqrestore(&udc->lock, flags); + return -ENOMEM; + } + } if (ep->epnum > 0) { if (ep->direct == USB_DIR_IN) memcpy(ep->virt_buf, req->req.buf, -- 2.39.2
