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usb: dwc2: avoid out of bounds access

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flush_dcache_range may access data after priv->aligned_buffer end if
len > DWC2_DATA_BUF_SIZE.
memcpy may access data after buffer end if done > 0

Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
This commit is contained in:
Stefan Brüns 2015-12-22 01:21:48 +01:00 committed by Marek Vasut
parent c75f57fba4
commit 5253aded46
1 changed files with 4 additions and 3 deletions
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7
drivers/usb/host/dwc2.c
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@ -823,12 +823,13 @@ int chunk_msg(struct dwc2_priv *priv, struct usb_device *dev,
(*pid << DWC2_HCTSIZ_PID_OFFSET),
&hc_regs->hctsiz);
if (!in) {
memcpy(priv->aligned_buffer, (char *)buffer + done, len);
if (!in && xfer_len) {
memcpy(priv->aligned_buffer, (char *)buffer + done,
xfer_len);
flush_dcache_range((unsigned long)priv->aligned_buffer,
(unsigned long)((void *)priv->aligned_buffer +
roundup(len, ARCH_DMA_MINALIGN)));
roundup(xfer_len, ARCH_DMA_MINALIGN)));
}
writel(phys_to_bus((unsigned long)priv->aligned_buffer),