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authorStefan Brüns <stefan.bruens@rwth-aachen.de>2015-12-22 01:21:48 +0100
committerMarek Vasut <marex@denx.de>2015-12-31 10:05:31 +0100
commit5253aded464f99734698bffd33c662f1ac071fd0 (patch)
treeacdf8e8e03aa39d560a65a74a994eacbbffeab92 /drivers/usb/host/dwc2.c
parentc75f57fba4712fed1b0f7b9b10c2bbfdb9ede449 (diff)
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usb: dwc2: avoid out of bounds access
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>
Diffstat (limited to 'drivers/usb/host/dwc2.c')
-rw-r--r--drivers/usb/host/dwc2.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c
index 541c0f9..5ef6deb 100644
--- a/drivers/usb/host/dwc2.c
+++ b/drivers/usb/host/dwc2.c
@@ -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),