linux-kernel - [PATCH 4.6 144/203] PCI: Fix unaligned accesses in VC code

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Date:	Mon, 25 Jul 2016 13:55:59 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Meelis Roos <mroos@...ux.ee>,
	Anatoly Pugachev <matorola@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 4.6 144/203] PCI: Fix unaligned accesses in VC code

4.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Miller <davem@...emloft.net>

commit ef0dab4aae14e25efddf1577736f8450132800c5 upstream.

The save/restore buffers for VC state is first composed of a 2-byte control
register, then a bunch of 4-byte words.

This causes unaligned accesses which trap on platform such as sparc.

This is easy to fix by simply moving the buffer pointer forward by 4 bytes
instead of 2 after dealing with the control register.  The length
adjustment needs to be changed likewise as well.

Fixes: 5f8fc43217a0 ("PCI: Include pci/pcie/Kconfig directly from pci/Kconfig")
Reported-by: Meelis Roos <mroos@...ux.ee>
Reported-by: Anatoly Pugachev <matorola@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/vc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/pci/vc.c
+++ b/drivers/pci/vc.c
@@ -221,9 +221,9 @@ static int pci_vc_do_save_buffer(struct
 		else
 			pci_write_config_word(dev, pos + PCI_VC_PORT_CTRL,
 					      *(u16 *)buf);
-		buf += 2;
+		buf += 4;
 	}
-	len += 2;
+	len += 4;

 	/*
 	 * If we have any Low Priority VCs and a VC Arbitration Table Offset