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fotg210-udc: Don't DMA more than the buffer can take

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[ Upstream commit 3e7c2510bd ]

Before this, it wrote as much as available into the buffer, even if it
didn't fit.

Fixes: b84a8dee23 ("usb: gadget: add Faraday fotg210_udc driver")
Signed-off-by: Fabian Vogt <fabian@ritter-vogt.de>
Link: https://lore.kernel.org/r/20210324141115.9384-7-fabian@ritter-vogt.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Fabian Vogt 2021-03-24 15:11:14 +01:00 committed by Greg Kroah-Hartman
parent e06d4a0c39
commit 7d5ff49321
1 changed files with 3 additions and 2 deletions
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5
drivers/usb/gadget/udc/fotg210-udc.c
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@ -338,8 +338,9 @@ static void fotg210_start_dma(struct fotg210_ep *ep,
} else { } else {
buffer = req->req.buf + req->req.actual; buffer = req->req.buf + req->req.actual;
length = ioread32(ep->fotg210->reg + length = ioread32(ep->fotg210->reg +
FOTG210_FIBCR(ep->epnum - 1)); FOTG210_FIBCR(ep->epnum - 1)) & FIBCR_BCFX;
length &= FIBCR_BCFX; if (length > req->req.length - req->req.actual)
length = req->req.length - req->req.actual;
} }
} else { } else {
buffer = req->req.buf + req->req.actual; buffer = req->req.buf + req->req.actual;